00:00Some men wear shoes with hidden heel lifts to look taller.
00:04Such shoes can make a person up to 6 inches taller.
00:07They look like regular shoes, but inside they have this extra insert.
00:12Sometimes, such an insert is glued down.
00:15Sometimes it's removable, and you can choose the height you need yourself.
00:20When the Titanic hit the iceberg and sank sometime later,
00:24the Atlantic Ocean was around 28 degrees Fahrenheit,
00:26which means the water was below its freezing point.
00:30No wonder so many passengers didn't make it.
00:34Some birds have a row of bristles protruding from the edges of their eyelids.
00:39Those bristles can probably be called eyelashes.
00:42But while human eyelashes are modified hairs meant to protect the eye,
00:46bird eyelashes are modified feathers.
00:50Identical twins don't actually have the same fingerprints,
00:53so you can't blame your misdeeds on your sibling after all.
00:57Different factors during development in the womb,
00:59like the position of the womb,
01:01umbilical cord length,
01:02and the rate of finger growth impact fingerprints.
01:06Earth's rotation speed is changing.
01:09It's slowing down right now while we're talking.
01:11It means that, on average,
01:13the length of the day gets 1.8 seconds longer every century.
01:17600 million years ago,
01:19a day lasted a mere 21 hours.
01:24Most world maps are wrong.
01:26On the majority of maps,
01:27they still use the Mercator projection,
01:29which was the first developed in 1569.
01:32But this method is very inaccurate,
01:35and makes Alaska look as large as Brazil,
01:38while in reality,
01:39it's five times smaller.
01:41As for Greenland,
01:42it looks 14 times larger than it actually is.
01:46For a map to be precise,
01:48it would need to be life-sized and round,
01:50not flat.
01:53Ants don't have lungs.
01:54They breathe through tiny openings known as spiracles.
01:58An ant may have 9 or 10 of those on each side of the body,
02:01depending on the species.
02:02The average color of the universe is poetically called Cosmic Latte.
02:09In a 2002 study,
02:11scientists discovered that the light coming from other galaxies
02:14averaged into a beige color that was very close to white,
02:18just like the drink beloved by many.
02:22There is such a thing as minus decibels.
02:25The quietest place on Earth
02:27is Microsoft's anechoic chamber in Redmond, USA.
02:30The level of sound there is minus 20.6 decibels.
02:35Such chambers are built out of heavy concrete and bricks,
02:38and are placed on springs to stop vibrations
02:40from entering the chamber through the floor.
02:45Bananas are radioactive.
02:47Wait, where did you go?
02:49It's not that bad.
02:51Bananas are rich in potassium,
02:52so each banana is slightly radioactive
02:54due to the natural isotope potassium-40.
02:58On the other hand,
02:59your body contains around 16 milligrams of potassium-40,
03:03so you're actually about 280 times more radioactive
03:06than that poor banana.
03:08And in any case,
03:09your body gets rid of that excess potassium-40
03:11from a banana within several hours.
03:16There's simply no such thing as a straight line.
03:19You just need to zoom in close enough,
03:21and you're bound to spot some irregularities.
03:24Even a laser light beam is a bit curved.
03:26In emergencies, fish form orderly lines.
03:31For example,
03:32when evacuating through narrow spaces in dangerous situations,
03:36school of neon tetrafish cue
03:38so that they don't crash into one another
03:40or clog up the line.
03:42Scientists think that this behavior means
03:45that fish can respect social rules
03:46even in emergency situations,
03:49unlike us humans.
03:52Hippos can't swim.
03:53These animals have large bones.
03:56These bones are so big and dense
03:58that it makes hippos barely buoyant at all.
04:01So, these animals don't swim.
04:03Instead,
04:03they perform something like
04:05a slow-motion gallop on the riverbed.
04:08Hippos can also sleep underwater
04:10thanks to a reflex
04:11that allows them to rise to the surface,
04:13take a breath,
04:14and sink back down to the bottom
04:16without waking up.
04:20Lego bricks can withstand compression
04:23better than concrete.
04:25A regular plastic Lego brick
04:26can support the weight of
04:27375,000 other bricks
04:30before it breaks.
04:32Theoretically,
04:33it could allow you to build a tower
04:34more than 2 miles in height.
04:36But if we decide to scale this up
04:38to house-sized bricks,
04:40the price would be exorbitant.
04:42If you ever go to space,
04:45you can take your yo-yo with you.
04:47In 2012,
04:48NASA astronaut Don Petit
04:50took a yo-yo on board
04:51the International Space Station
04:53and used it to show some tricks.
04:55You see,
04:56a yo-yo mostly relies
04:57on the laws of conservation
04:58of angular momentum
05:00to perform tricks.
05:01And if you keep the string taut,
05:03these laws apply in microgravity too.
05:07There's a theory that claims
05:08that we sweat when we're anxious
05:10to alert the brains of other people
05:12that they're primed
05:13for that danger
05:14that's making us feel anxiety.
05:16Brain scans have revealed
05:17that when you sniff the sweat
05:19produced by a panicking person,
05:21regions of the brain
05:22responsible for emotional
05:23and social signals light up.
05:26And when you are anxious,
05:27your sympathetic nervous system
05:29produces hormones,
05:30including adrenaline,
05:31which switches on your sweat glands.
05:34There are rainbows on Venus,
05:36and they're called glories.
05:39A glory looks like a series
05:40of colored concentric rings
05:42and is caused by the interference
05:43of light waves inside droplets
05:45rather than the process
05:47of reflection, refraction,
05:48and dispersion of light,
05:50which produces rainbows.
05:53Protons look like bagels,
05:55spheres, peanuts,
05:56and rugby balls.
05:58In other words,
05:58protons come in different shapes
06:00and sizes.
06:01Their appearance changes
06:02based on the speed of quarks,
06:04smaller particles within them.
06:07If you look at the moon
06:08while being in the southern hemisphere,
06:10it will seem to be upside down,
06:12and the man on the moon
06:13will look more like a rabbit.
06:16You will remember more of your dreams
06:18if you sleep badly
06:19and wake up many times
06:20throughout the night.
06:21You're also more likely
06:22to remember your dream
06:23if someone or something
06:25wakes you up in the middle of it.
06:27Dogs tilt their heads
06:28while listening to people
06:29to pinpoint familiar words
06:31like walkies more effectively.
06:34It also helps them
06:35to understand the tone
06:35of your voice better.
06:37There's also an idea
06:38that if a dog
06:39doesn't tilt its head often,
06:40it's because it relies
06:41more on sight
06:42and less on sound.
06:46Mirrors facing each other
06:48won't produce
06:49infinite reflections.
06:50Each next reflection
06:51will be darker
06:52than the previous one,
06:53and eventually,
06:54they will fade
06:55into invisibility.
06:57Mirrors absorb
06:58just a fraction
06:59of the energy
06:59of the light
07:00falling on them,
07:00so the total number
07:02of reflections
07:02mirrors can produce
07:04is around several hundred.
07:07You can smell ants
07:08since many species
07:09of these insects
07:10produce strong-smelling chemicals
07:12when they feel threatened
07:13or angry
07:14or when they're being squished.
07:16Trapjaw ants release
07:17a chocolatey smell
07:18when they're crushed,
07:19and citronella ants
07:21give off a lemony odor
07:22when they're threatened.
07:23Giraffes hum
07:26when they want
07:27to communicate
07:27with each other.
07:28Researchers think
07:29that this low-frequency humming
07:31might be a form
07:32of contact call
07:33between individuals
07:34that have been separated
07:35from their herd.
07:37It can also help giraffes
07:38find each other
07:39in the dark,
07:40but the coolest thing
07:41about these magnificent animals?
07:43Some scientists think
07:44that they could sleep talk, too.
07:49And a cool bonus story
07:50for you
07:51about a marathon runner
07:52who took over 50 years
07:54to finish the race.
07:56Japanese marathoner runner
07:57Shizu Kanakuri
07:58was selected
08:00as one of the two athletes
08:01that Japan could send
08:02to the 1912 Stockholm Olympics.
08:05But Kanakuri
08:06shockingly disappeared
08:07during the marathon race.
08:09It turned out
08:10that after a rough
08:1118-day-long trip
08:12to Stockholm,
08:13first by ship
08:14and then by train,
08:15the man was exhausted.
08:17During the race,
08:18he stopped running
08:19because his condition
08:20simply didn't allow him
08:21to run further.
08:22The athlete stumbled
08:24into a nearby garden party
08:25where he drank orange juice
08:27and stayed for a while
08:28to recover.
08:29Later,
08:30Kanakuri was so embarrassed
08:31by his failure
08:32that he returned to Japan
08:34without notifying anyone,
08:36including race officials.
08:38So,
08:38Swedish authorities
08:39considered him missing
08:40for 50 years
08:41before finding out
08:43that he was peacefully living
08:44in his home country.
08:46In 1967,
08:47the athlete was offered
08:48the opportunity
08:49to finish his run.
08:51He accepted.
08:5154 years,
08:538 months,
08:546 days,
08:555 hours,
08:5532 minutes,
08:56and 20.3 seconds
08:58after he started the race,
08:59he completed the marathon.
09:01It was a long trip.
09:03Along the way,
09:04the man got married,
09:05had 6 kids,
09:06and 10 grandchildren.
09:07That's it for today.
09:11So,
09:11hey,
09:12if you pacified your curiosity,
09:13then give the video a like
09:15and share it with your friends.
09:16Or,
09:16if you want more,
09:17just click on these videos
09:18and stay on the bright side.
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