- 10 hours ago
You can clean wallpaper with Play-Doh and other objects with hidden features!
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00:00If you ever find yourself stuck in the trunk of your car, stay calm.
00:04All cars are supposed to be equipped with an emergency latch to help open the trunk from the inside in
00:10the unlikely case it happens.
00:12These latches are so well thought out that they can be opened by people of all ages.
00:17More so, handles are designed to glow in the dark, too.
00:20You can even pull them with a mouth if there's not enough wiggle room to use your hands.
00:25Never mind how you ended up in the trunk in the first place.
00:28Moving on.
00:29If you're ever working with needle and thread, remember you don't need to stick the needle directly into the spool.
00:36You may end up losing the needle altogether.
00:38Not to mention you can easily hurt your fingers.
00:41A lot of modern sewing kits these days come with a designated place for safeguarding the needles.
00:47It's located at the bottom part of the thread spool.
00:50You'll just need to pull it out.
00:51It's even made to hold multiple sewing needles at a time.
00:56Disposable ballpoint pens come with a little secret of their own.
01:00Did you ever notice that in some of them, there's a small hole in the plastic part?
01:04It's actually a rudimentary ventilation system.
01:08It's supposed to let the ink easily make it to the tip of the pen.
01:12Okay, I know it's in the name.
01:13But you really don't need to shake the seasoning shaker to get any product out.
01:18Don't believe me?
01:20Hey, you're not the only one.
01:21Go grab your favorite seasoning bottle out of your pantry.
01:24If it has one of those removable plastic caps, it's perfect for the experiment.
01:30Instead of shaking the bottle, try holding it from the plastic cap while it's upside down.
01:35Now gently twist the bottle from side to side and, before you know it,
01:40you get some gorgeously flowing seasoning without having to wiggle the shaker and make a mess all over the stove.
01:47On the same note, most salt and pepper shakers should have ridges on the bottom of the glass portion.
01:53In case you get any seasoning stuck in there,
01:56place the bottom of the salt shaker against the bottom of the pepper shaker and wiggle it around,
02:01so the ridges click with each other.
02:03The seasoning should easily pour out now without you having to open the bottle.
02:08In colder weather, you often have so many clothing layers on you
02:12that you can hardly feel the purse or back straps on your shoulder anymore.
02:16Not to mention how fast they can slide off.
02:19Some jackets come with a built-in solution for that,
02:22in the form of a small tab on the shoulder with either a hook or a button.
02:27It's meant to be opened and closed comfortably,
02:29so you can keep your purse in place at any time.
02:34You're most likely using it merely to peel the skin of potatoes, carrots, or cucumbers.
02:39But you can use your vegetable peeler for chopping fine strips of onion as well.
02:44Just cut the onion into quarters vertically and then start slicing.
02:48This might also help out with those embarrassing onion tears.
02:53Most people miss this one, but should you ever have a closer look at your toothpaste tube,
02:58you will surely see some sort of coloring there, either a dot or a block.
03:03Colors can vary.
03:04They can be black, green, red, or even blue.
03:08These color spots are actually meant to help the assembly machines back at the toothpaste factory.
03:13They recognize when and where these machines need to cut the toothpaste tubes
03:17and proceed to fold them for packaging.
03:20For most types of footwear, if there's anything that seems a bit out of place,
03:24always know that it's there for a reason.
03:27Most manufacturers don't put extra items on shoes just for fun.
03:31It would definitely be a waste of time and resources.
03:34For footwear, like boots, for example, there's often a small loop at the top back of the shoe.
03:40It's there to help you when you need to put the shoe on, since you can quickly pull on it.
03:44Plus, you can also hang the shoes somewhere, most likely to dry,
03:48since most boots are meant to be worn in the colder weather.
03:52Now, I've been guilty at least once of overdressing with a bunch of layers,
03:57just so I won't need to jam everything in my check-in bag.
04:00But does it become a problem when you actually have to get seated?
04:04What do you do with your coat or your jacket?
04:07Well, have a closer look next time you board a plane on the seat in front of you.
04:11The hook that keeps the tray table upright can double as a jacket hook.
04:16As long as you don't need to have any meals while in the air, you're good to go.
04:21Now, most mascaras expire within 3 to 6 months, I'm told, depending on the manufacturer.
04:27But you can help speed up that process if you're not careful enough.
04:31Continuously pumping the mascara wand, trying to mix in the product,
04:35actually pushes more air into the tube.
04:38This can make it dry much faster, and you evidently won't get the desired results with it anymore.
04:44There's an easy way to check if your mascara is still good enough to use.
04:48If you don't hear a popping noise when you take the brush out,
04:52you may very well need to go get yourself a new mascara tube.
04:56Now, I know we're living in the era of Bluetooth-connected devices.
05:00But for better quality sound, they still recommend using headphones that connect via audio jacks.
05:07Remember seeing black ridges on those jacks?
05:10They aren't there just to make them fit when you plug them into your phone or laptop.
05:14Made out of a special insulating material,
05:17these bands are meant to guard the wires when sound is being transmitted.
05:21Based on the number of bands, you can figure out which end goes where.
05:25Some empty space under noodles in a cup doesn't mean the company producing them wants to cheat you out of
05:31a full portion.
05:32No, no.
05:33It's a manner of keeping the noodles intact during their transportation.
05:37It also helps with the circulation of hot water that is poured over the products before you can enjoy them.
05:43The V-shaped neckline was initially designed to serve a bunch of objectives.
05:48First, as a way of prolonging the life of the garment that would maintain its shape over the years.
05:53It's also there to fit your head through the shirt in case it needs some stretching.
05:58This way, it ensures a snugger grip around the neck.
06:01Lastly, it helps absorb sweat in case you're wearing the shirt while exercising.
06:06Now, it's not necessarily a custom anymore,
06:09but you may have stumbled upon a dinner jacket with an additional mysterious pocket on the right side.
06:16Turns out, this pocket was used by men to easily reach their train tickets,
06:20since most of them had to travel to work every day.
06:23It helped them keep their jacket buttoned up, but also benefited from the use of a pocket.
06:29Now, it's only added as a decoration, and it doesn't serve an actual purpose anymore.
06:34Speaking of things we don't use these days, or at least for their initial purpose,
06:39did you know Play-Doh was originally a cleaning product?
06:42In the 1920s, the market was in need of a product
06:46that could help them wipe the wallpapered areas around coal-burning furnaces.
06:51The recipe for what we now know as Play-Doh was thus invented.
06:55It was manufactured in white only,
06:57and was supposed to clean wallpaper by being rolled back and forth over the dirt.
07:02It was only later, in the 1940s, that new products for cleaning wallpaper were brought up,
07:08and Play-Doh was redirected toward another area of the market.
07:12Now, while I enjoy a nice piece of toast for breakfast,
07:16isn't it pesky to have to clean out the toaster?
07:19Well, not anymore, since I recently found out that toasters have a slide or a panel at the bottom
07:25that helps get rid of all those annoying breadcrumbs easily.
07:31Now, there used to be a time when you could only have access to video games
07:36by inserting cartridges in your console of choice.
07:39These tiny objects gave many doctors a lot of headaches.
07:43People soon started popping up in hospitals after swallowing small game cartridges,
07:49especially the younger generation.
07:51Nintendo, the company that manufactures the majority of these devices,
07:55had to come up with a creative solution to prevent these accidents.
07:59So, these days, Nintendo Switch cartridges are purposely coated with specific chemicals
08:04that can leave a really bad bitter taste in the mouth.
08:08Not that I'd, you know, recommend you ever try and taste for yourself.
08:12Hmm.
08:13Okay, I know it's kind of cold to the touch,
08:15especially on a freezing winter's day,
08:17but did you know that brass doorknobs actually serve a purpose
08:20apart from looking classy and shiny?
08:21Since it's a copper alloy, brass has antimicrobial properties.
08:26That means it can help get rid of harmful germs and bacteria,
08:29sometimes in up to two hours.
08:31In high-traffic areas, that's all the more useful,
08:34but since brass is much costlier than other metals like nickel and steel,
08:38you barely see these types of doorknobs anymore nowadays.
08:42Speaking of lovely multipurpose items,
08:44most screwdrivers have a tiny little secret of their own.
08:47They can sometimes be slid through a wrench
08:49so that they can be used to create more torque when twisting,
08:53not to mention the uses when it comes to bolts in hard-to-reach places.
08:57There's a reason why buttons on women's shirts are for the left-handed,
09:01and it has nothing to do with fashion.
09:03This practice dates back to the times
09:06when chambermaids were helping ladies dress themselves,
09:08and it was easier for them to perform their job with this orientation.
09:13Having the buttons placed as such indicated a sign of wealth,
09:16so it's easy to imagine why the practice carried on,
09:19even though most people dress themselves nowadays.
09:23Next time you receive a package in your mail,
09:25take a look at your box cutter.
09:27If it features some diagonal lines on the blade,
09:30you're in for a little design perk.
09:31Turns out that these are blades that snap off.
09:35Continuously cutting cardboard can dull the sharp edge of the blade.
09:38To help prevent the need to buy a brand new box cutter,
09:41the top segment along the next line
09:43can be broken off to reach a new sharp edge.
09:46To do this, check out the small hole at the base of the tool,
09:49sometimes called the blade snapper.
09:52The people that first came up with this brilliant invention
09:55were engineers inspired by the way chocolate bars are segmented.
09:58Hold on a minute, don't throw away the cardboard package just yet.
10:02Most likely, you'll have some silica gel packets
10:04somewhere at the bottom of the box.
10:06Since this gel is basically a drying tool,
10:09it gathers up the moisture out of its environment,
10:11so you can store these packets for further occasions.
10:14Whether you'll need to dry out your phone
10:16or some other electrical object,
10:18you can place them in a container next to the silica gel
10:21to reduce the damage.
10:23You don't have to be a mechanic to know
10:25when a standard car tire needs replacing,
10:27since they come equipped with a neat indicator.
10:29Take a closer look,
10:31and you'll see that treads within the tire
10:33are a bunch of rubber notches.
10:35When the treads are evened out with the perpendicular bars,
10:38it's a sign you need to book an appointment
10:40with your local car service,
10:42since most likely the tires have lost most of their traction
10:45and may not be safe for driving any longer.
10:48The upper corners of a car windshield
10:50feature textured black dots
10:52melted into the glass edges.
10:54This neat add-on isn't there for design purposes.
10:57It's called frit glazing,
10:59which means that a special type of ceramic paint
11:02is added to the window
11:04for protecting its sealant from UV rays.
11:07Check out if there's a small tab
11:09under your car's rearview mirror.
11:11Bet you didn't know it's there
11:12to help switch the mirror
11:14from daytime to nighttime views.
11:16It uses a prismatic glass technology
11:19to blur the reflection
11:20and reduce the glare of headlights behind you in traffic.
11:24People came up with these manually tilted mirrors
11:26in the 1930s,
11:28but they became standard somewhere in the 1970s.
11:31While you're in the car,
11:33check out the headrests,
11:34as you most likely don't know
11:35that they carry a little disguised purpose.
11:38Of course,
11:39they're adjustable to accommodate passengers
11:41of any height
11:42so that they get the proper support
11:43for their heads and necks.
11:45The hidden feature
11:46is that they are detachable
11:47and come with two very solid metal bars.
11:51Should you ever find yourself stuck in a car
11:53and need to make a fast getaway?
11:55These bars come in handy
11:56to crack out the car windows.
11:59So you're out for a drive
12:00and you're suddenly out of gas.
12:02What I'm about to describe
12:03sounds more like a meme
12:04than an actual situation bound to happen.
12:07But what if you're in such a hurry
12:09that you accidentally drive off
12:11with the gas nozzle still in the tank?
12:13Well,
12:14the nozzles have been designed
12:15to prevent any hazards from happening.
12:17Rest assured,
12:18they feature a breakaway device
12:20that will allow the hose
12:21to separate when taken out
12:23with enough force.
12:25Initially designed
12:26in the early 20th century
12:27to be worn exclusively
12:28by basketball players,
12:30sneakers soon became
12:31one of those fashion fundamentals
12:33similar to jeans and leather jackets.
12:35If you take a closer look at them,
12:37you'll see they have
12:38two extra holes on the side,
12:39similar to the shoelace holes.
12:41They're manufactured as such
12:43not only to provide extra ventilation,
12:45but to allow people
12:46to get extra creative
12:47with their laces
12:48when wearing the shoes.
12:50Admit it,
12:51you've always thought
12:51that chopsticks are merged
12:53at the end
12:53for the sole purpose
12:54of keeping them together
12:55until you're ready
12:56to dig into your meal.
12:57That may or may not be
12:59the whole truth.
13:00Under a more detailed inspection,
13:02the wooden tools feature
13:03a square-shaped end.
13:05Chopsticks manufactured like this
13:07date back to an old
13:08Japanese traditional design,
13:10which can help
13:11with breaking the ends easily.
13:12The separated end
13:14can then be used
13:15as a resting block
13:16for the chopsticks
13:17to keep it more sanitized
13:18in hopes it can be used again,
13:20since they won't be touching
13:21the table or any other surface.
13:24Women's bikes
13:25have a special design,
13:26which, surprisingly,
13:27has a historical
13:28and fashionable purpose.
13:30The lower frame
13:31is for the most part
13:32meant to make up
13:33for the generally shorter
13:34height of ladies,
13:35compared to that
13:36of the average gentleman.
13:37While that is the case
13:39for handlebars and saddles,
13:41the overall frame
13:41is lower for an additional purpose.
13:43Way back when women
13:45wore long skirts
13:46and dresses all day,
13:47every day they needed
13:48to make sure their outfits
13:49wouldn't get caught
13:50in the frame.
13:51That's how we came up
13:52with a lower-framed bicycle,
13:54perfectly made for women
13:55and their needs
13:56at the time.
13:58The fact that toothpastes
14:00are multicolored
14:01is not just a nice perk
14:02to make dental hygiene
14:03more fun.
14:04There's a secret meaning
14:05related to each of the colors,
14:07which dates back
14:08to the 1970s.
14:09In those days,
14:11people grew more
14:12and more interested
14:13in their oral health care,
14:14and as such,
14:15they were looking
14:16for products
14:17which could do more
14:18than merely clean their teeth.
14:20One company
14:21was the pioneer
14:21in that regard,
14:23adding mouthwash
14:23to its toothpaste,
14:24meaning the blue strip.
14:26They later added on
14:27the red strip,
14:28meant to feature ingredients
14:30which helped with gum care.
14:32Speaking of toothpaste,
14:33check the cap
14:34next time you open a new tube.
14:35You may be in
14:36for a little surprise.
14:38There's a pointed cone shape
14:39inside the cap
14:40so you can puncture
14:41the seal of the toothpaste
14:42without cutting yourself
14:44or ruining your manicure.
14:45Not to mention,
14:46it's more hygienic
14:47since you won't be able
14:48to transfer germs
14:49or other bacteria
14:50into the product itself.
14:52On the subject
14:54of bathroom countertop items,
14:56toothbrushes come
14:57with a neat add-on
14:58hidden in the bristle patterns.
14:59Apart from making
15:00the toothbrush look cooler,
15:02they also do come
15:03with a practical purpose.
15:05Most toothbrushes
15:06come with a pattern
15:07of blue bristles
15:08intertwined with white ones.
15:09The blue dye
15:10is meant to fade out,
15:12signaling the time
15:12when you need
15:13to replace your toothbrush.
15:15Dentists say that
15:16toothbrushes should be replaced
15:18every three to four months,
15:19but it does serve
15:20as a great reminder
15:21in case you forget.
15:22Still love playing with Lego?
15:24Don't judge.
15:26Hey, it's a great hobby
15:27for all ages.
15:28Notice there's a hole
15:29on top of the Lego heads.
15:30Behold, you're looking
15:32at a safety feature
15:33that the people at Lego
15:34designed to prevent
15:35choking hazards.
15:37The most dangerous issue
15:38should a person swallow
15:39any of these pieces
15:40is the blocking of the airways.
15:43Designing a hole
15:44inside the Lego head
15:45helps the air
15:46to flow freely
15:47through the piece
15:48until it can be removed safely.
15:50We're now used
15:51to all sorts of
15:52modern light bulbs,
15:53some tubular,
15:54some shaped like diamonds,
15:55and some even
15:56twisted all together.
15:58Historically,
15:59light bulbs were round
16:00and the initial shape
16:01served a purpose in itself.
16:03It was mainly connected
16:05to the fact
16:05that glass bulbs
16:06were hand-blown,
16:07which gave them
16:08the round shape
16:09to begin with.
16:10The hidden practical reason
16:11was that the light bulb filament
16:13needed to be
16:13at the same distance
16:14from every surface
16:15of the glass sphere.
16:17The easiest way
16:18to achieve this
16:19was to make the glass
16:20in the shape of a globe.
16:21They make plane wings smooth
16:22to let air flow
16:24easily around their surface
16:25and reduce resistance
16:26during the flight.
16:27So why did they add
16:29these convex yellow hooks?
16:31They obviously
16:32worsen the aerodynamics.
16:34Yeah, they do,
16:35but they're also necessary
16:36for your safety.
16:38Imagine a plane
16:39making an emergency landing
16:40in the open sea.
16:42Everything's going well.
16:43The aircraft
16:44is sliding on the water.
16:46Then, rescue boats
16:47sail to this place
16:48to evacuate the passengers.
16:50They leave the plane
16:51through emergency exits
16:52located above the wings.
16:54Before the door opens,
16:55the escape slide inflates.
16:57Passengers need to walk
16:59on the wing
16:59and go down the slide,
17:01but the wing surface
17:02is slippery
17:03because of water.
17:04They might fall
17:04and get hurt.
17:05To prevent this,
17:07the stewards install
17:08a rescue rope.
17:09They attach one end
17:11to the door
17:11and the other
17:12to the edge of the wing,
17:14passing it through
17:14these hooks.
17:16During the evacuation,
17:17people hold onto this cable
17:19like a railing
17:20and don't fall.
17:21They can also attach
17:22rescue boats to the wing
17:24with a rope and these hooks
17:25so the sea won't take people
17:27far away from the plane.
17:28By the way,
17:29the plane can stay
17:30on the water
17:31for 10 minutes
17:32to 60 hours
17:33depending on the model,
17:34weather conditions,
17:35and the pilot's skills.
17:37Both the main
17:38and emergency exits
17:39have extra handles
17:40for crew members.
17:41During an evacuation,
17:43people may panic
17:44and accidentally push
17:46the flight attendants
17:46off their feet.
17:47To avoid a fall,
17:49they hold onto
17:50these handles.
17:51A seat belt
17:52on an airplane
17:53has a slightly different
17:54purpose from that
17:55in your car.
17:56The one in the vehicle
17:57protects you
17:57from a horizontal hit.
17:59When a plane
18:00is going through turbulence,
18:01it's shaking up and down.
18:03Your waist belt
18:04keeps you from
18:04hitting the ceiling.
18:06Crew members have handcuffs
18:08for problem passengers.
18:10If someone behaves badly
18:11and interferes
18:12with the flight,
18:13flight attendants
18:14have the right
18:14to chain them
18:15to their seats.
18:16To do this,
18:17they use police handcuffs
18:19or plastic ties.
18:20This is the maximum
18:21that can be done
18:22during the flight.
18:23Then,
18:24they report a rowdy person
18:25to the airport
18:26and hand them over
18:27to the police
18:28after landing.
18:29During an emergency,
18:31oxygen masks
18:32drop automatically.
18:33They have an extra purpose
18:35you might not know about
18:36to equalize the pressure
18:38and prevent panic.
18:40Air pressure can change
18:41because of turbulence.
18:42So,
18:43among other things,
18:44the masks
18:44help passengers
18:45stay calm.
18:47Your seat
18:48is your safe haven.
18:50That life jacket
18:51under it
18:51won't let you drown.
18:52Also,
18:53the seat's surface
18:54is made of
18:55waterproof material.
18:56If water gets
18:57into the cabin,
18:58the seat will save you
18:59from freezing
19:00since it won't get wet.
19:02It's also fireproof.
19:04The cover can prevent
19:05the fire from spreading
19:06through the cabin.
19:07But,
19:08more importantly,
19:09it can save you
19:10from the flames.
19:11Of course,
19:12you'll most likely
19:13never have to use
19:14this feature,
19:14but it's nice
19:16to feel safe,
19:16isn't it?
19:17You can use
19:18the tray table
19:19in the seat
19:19in front of you
19:20like a hammock.
19:21Just tie a belt,
19:23a blanket,
19:23or a towel
19:24around the table
19:25and stretch
19:26your feet out.
19:27You might have noticed
19:28black triangles
19:29on the wall
19:30above the seats.
19:31For you,
19:32as a passenger,
19:33they may indicate
19:34the seats that have
19:35the best view
19:35of the wings
19:36where you can take
19:37the most beautiful
19:38flight photos.
19:39But the triangles
19:40weren't created
19:41for your camera.
19:42The crew members
19:43monitor the condition
19:44of the aircraft
19:45through windows
19:45under these signs.
19:47Suppose the wings
19:48freeze,
19:49the engine catches fire,
19:50or the pilot
19:51receives a signal
19:52about some problem.
19:53In that case,
19:54the crew will quickly
19:55move to the triangles
19:56and assess the situation.
19:59And there you are,
20:00sitting under the triangle,
20:02looking at the wing
20:02and thinking,
20:03why are the wings
20:04located in the lower
20:05part of the plane?
20:06They could install them
20:07above the windows
20:08or right in the center.
20:10Actually,
20:11some planes have them
20:12in the middle
20:13and higher up.
20:14And each location
20:16makes sense.
20:17The engine and turbines
20:18are under the wings.
20:20It's much easier
20:21to repair them
20:21since they're close
20:22to the ground.
20:23And in case of an emergency
20:25landing in the sea,
20:26the wings act
20:27as a rescue cushion.
20:29They help to keep
20:30the plane on the water.
20:31Empty fuel tanks
20:32under the wing
20:33can also help the plane
20:34stay on the surface.
20:35But this position
20:37has certain risks.
20:38Debris can get
20:39into the turbines
20:40on the runway.
20:41Fortunately,
20:42this is unlikely
20:43to happen
20:43since they carefully
20:44clean it.
20:46Planes with wings
20:47in the middle
20:48get the least air resistance.
20:49That's why they build
20:50fighter jets
20:51and supersonic aircraft
20:52this way.
20:54Big cargo planes
20:55have wings
20:55in the upper part
20:56of the hull.
20:57Thanks to it,
20:58the aircraft stays
20:59close to the ground.
21:00It makes it easier
21:01to load cargo.
21:03Also,
21:03it's safer to land
21:05on unprepared runways
21:06with high wings
21:07since debris
21:08won't get into
21:09the turbines.
21:09The aerodynamics
21:11of these planes
21:11works better
21:12thanks to such wings.
21:14They get less air resistance
21:15and deliver cargo faster.
21:18Oxygen inside the masks
21:19is a combination
21:20of chemicals.
21:22The transportation
21:22of oxygen tanks
21:23is too expensive
21:24for the airline.
21:25They take up
21:26a lot of space
21:27and increase weight,
21:28which leads
21:29to extra fuel consumption.
21:30Therefore,
21:31they use a chemical
21:33oxygen generator.
21:34It's located
21:35in the panel
21:36above your head.
21:37There's a small tank
21:38with barium,
21:39sodium,
21:40and potassium compounds.
21:42They mix
21:42and create
21:43a hot chemical reaction
21:44that releases oxygen
21:46and passes it
21:47into the mask.
21:49Small holes
21:50in windows
21:50save the glass
21:51from breaking.
21:53The air pressure
21:53inside the aircraft
21:54is much stronger
21:55than that outside.
21:57The difference
21:57is so big
21:58that the air
21:59can just break
22:00the glass
22:00from the other side.
22:01To prevent this,
22:03they drill
22:03small holes.
22:04The air
22:05penetrates there
22:06and reduces
22:07the load
22:07on the window.
22:09By the way,
22:10they have a round shape
22:11for the same reason.
22:12It's ideal
22:13for an equal distribution
22:14of air.
22:15If they were square
22:16or triangular,
22:18air streams
22:18with moisture
22:19would accumulate
22:19in the corners.
22:20It would lead
22:21to destruction.
22:22Plus,
22:23all water gets dried out
22:24thanks to the hole.
22:26Windows are made
22:27of triple glass.
22:29The outer glass
22:30takes the pressure.
22:31The middle one
22:31works like a fuse.
22:33The third layer
22:34protects the second one
22:35from passengers
22:35who like to touch it.
22:37Technically,
22:38the plane could fly
22:39with one layer,
22:40but it would be dangerous.
22:42They also installed
22:44extra protection
22:45for the wheels.
22:45They experience
22:46huge loads
22:47during landing,
22:48but don't worry,
22:49they won't burst.
22:50The tires
22:51can withstand pressure
22:52five to seven times
22:54bigger than they
22:54actually get.
22:55See the toilet sign
22:57on the door?
22:58There's a secret
22:59latch under it.
23:00Crew members
23:01can unlock the door
23:02from the outside
23:02so don't expect
23:04complete privacy.
23:05Of course,
23:06it's prohibited
23:07for other passengers
23:08to do that.
23:09The cabin crew
23:10can open it
23:10in case of emergencies.
23:12When flight attendants
23:14pass through the cabin
23:15during the flight,
23:16they always touch
23:17the upper shelves
23:18above the seats.
23:19They don't check
23:20if the luggage compartments
23:20are closed.
23:22Along the bottom
23:22of these compartments,
23:23there are handles
23:24in the form
23:25of jagged edges.
23:26Flight attendants
23:27hold onto them
23:28not to fall.
23:29It's a pretty
23:30convenient thing,
23:31especially for those
23:32who don't like
23:33touching the seats
23:33with sitting passengers
23:34on the way
23:35to the toilet.
23:36There's an important
23:37reason why they
23:38install turbines
23:39under the wings.
23:41Previously,
23:41they put them
23:42in the plane's tail
23:43to improve the
23:44aerodynamics
23:44of the flight.
23:45If one of the engines
23:47stopped working,
23:48the cabin wouldn't
23:49shake so much.
23:50Yes,
23:51planes can fly
23:51with one turbine running.
23:53Also,
23:54the wings were thinner
23:55and streamlined
23:56thanks to turbines
23:57in the tail,
23:58which was also good
23:58for aerodynamics.
23:59But it turned out
24:01that such a location
24:02meant additional costs.
24:04The engine in the tail
24:05was inconvenient
24:06to maintain.
24:07They used to place it high,
24:08so people needed
24:09special equipment
24:10and extra time
24:11to service it.
24:12And of course,
24:13it affected the ticket price.
24:15They started to install
24:16turbines under the wings
24:17to save money
24:18and time.
24:20Have you ever noticed
24:21the flashing light
24:22in the cabin
24:23before takeoff?
24:24This happens
24:24when the pilot
24:25disconnects a plane
24:26from the airport
24:27power supply
24:28and switches
24:28to the onboard one.
24:29This rapid transition
24:31may cause flashing.
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