00:00Bobby was invited to take part in a famous game show.
00:08If she got all the answers correctly, she would win the prize of a million dollars.
00:13For the first round, she needed to match the bird in the image with its correct shadow.
00:18Can you help her out?
00:21Yep, it's the fifth shadow, that's the correct one.
00:33For the second round, she needed to solve this rebus puzzle.
00:37Take a look at the image.
00:38Can you help Bobby figure out the next two letters?
00:50The answer was staring her right in the face, quite literally.
00:54The next two letters were A and W, which are the initial letters of the word AND plus the
00:59word Y.
01:04Next up, the game show host projected this image right in front of her.
01:08He asked her if she could find the hidden number in the image.
01:12Can you guess which number Bobby answered?
01:23Number two!
01:24It was hidden right there in the middle.
01:28Since Bobby was getting everything right, the game show presenter decided to make the
01:33riddles more difficult.
01:35He asked her how many circles were in this image.
01:38Can you help her out here?
01:49This one was a little trickier, but there are six circles.
01:54Bobby was getting closer to the final round, so the host decided to make her life a bit
01:59more difficult.
02:00He picked a riddle that 90% of the people failed to know the answer to.
02:05Take a look at this image.
02:06The host asked Bobby to cut the main object in the image into four equal parts.
02:12How could Bobby do that?
02:23There it is!
02:24You just divide the big shape into smaller versions of itself!
02:29To win the final prize, the host came up with a riddle on the spot.
02:33He asked Bobby, On my way to Berlin I saw a man with seven wives.
02:38Each wife had seven sacks.
02:40Each sack had seven cats.
02:42Each cat had two kittens.
02:44How many were going to Berlin?
02:46Can you help Bobby figure out the answer to this riddle?
02:53Well, only one person was going to Berlin, the person who saw the whole thing.
03:03Way to go, Bobby!
03:04You just won a million bucks!
03:08Dan opened a time portal and set free a group of mutant ants inside his lab.
03:13The four humans left in the lab needed to escape before the ants caught up.
03:17To do so, they needed to cross an old rope bridge hanging on top of a massive gorge.
03:24By Dan's calculations, the ants would catch up with the lab team in 17 minutes.
03:28They needed to get everyone across the bridge before that.
03:32Dan was the fastest one in the group.
03:34He could cross the bridge in one minute.
03:36The lab assistant, Becky, could cross it in two.
03:40But the janitor and the professor were slower.
03:42The first needed five minutes and the second needed ten.
03:46How could they arrive at the other side safely, knowing that the bridge could only hold two
03:51people at a time and each group needed to carry the sole lantern left to illuminate
03:56the way?
04:07Here's how it works.
04:08Dan and Becky cross first, carrying the lantern.
04:11After two minutes, both of them are across the bridge and Dan, the quickest, runs back
04:15with the lantern.
04:17Then the professor and the janitor cross together, taking them ten minutes.
04:21In total, 13 minutes have elapsed.
04:24Becky grabs the lantern from them and dashes across the bridge to help Dan get across.
04:29With two minutes left on the clock, Dan and Becky arrive safely on the other side, just
04:34in time to cut the rope and save their lives.
04:39Alice had an epic fight with her best friend, Jen.
04:42They were supposed to go hiking together, but after the fight, Alice decided to go alone.
04:48After a long walk, she found a place to settle down for the night.
04:52She made all the provisions to have a safe camping night, but the next morning when she
04:56woke up, she saw that her food bag was empty.
05:00Someone had stolen all the food inside and only left the bag.
05:04Take a look at the image.
05:06Can you find out who the culprit was?
05:13Well, although there were animal footprints on the floor, none of these animals were big
05:22or tall enough to reach Alice's bag hanging on the tree.
05:26But hey, what's that?
05:28It looks like Jen's hairband!
05:30She must have followed Alice and decided to prank her by stealing her food!
05:36Peter got tired of big city life and moved to a quiet village.
05:40He opened a small coffee shop and his place soon got popular.
05:44His coffee shop was the talk of the town.
05:46Farmers, hipsters, and travelers came all over the region to drink his famous cappuccino.
05:53He even won an award for best coffee shop in the area!
05:56Until one night, someone broke into the coffee shop and stole his yearly supply of milk and
06:01coffee.
06:03Peter decided to investigate on his own and interrogated four suspects.
06:08Dylan, a painter, said he'd been out of the city that night.
06:11Leia, who worked at the coffee shop, said she had been working on a personal project
06:15all night long.
06:17Vanessa said she'd been rehearsing a dance for the upcoming New Year's presentation.
06:21And Jason, a farmer, said he'd been taking care of his cattle.
06:25Take a look at the suspects.
06:27Can you figure out who's the culprit?
06:39They sure didn't have the best alibis, but the culprit is definitely Vanessa.
06:44She said she was rehearsing for a New Year's show.
06:47But take a look at these flowers.
06:49It's clearly spring!
06:52For a school challenge, 100 students received a number between 1 and 100.
06:58Each student was instructed to go inside a classroom that had exactly 100 boxes, randomly
07:03numbered between 1 and 100.
07:06Inside each box there was a slip of paper, also containing a random number between 1
07:11and 100.
07:13Now each student needed to enter the classroom on their own and find the box that contained
07:18the slip of paper with the student's number on it.
07:21But to do so, the student was only allowed to open a maximum of 50 boxes.
07:27They were instructed to leave the room exactly as they found it, and they weren't allowed
07:31to communicate with any other students once they'd left the room.
07:35If all the students were able to find their numbers in the slips of papers inside the
07:39boxes, they would each win $100.
07:42But if even one of them wasn't able to find their number, then none of them would win
07:46the prize.
07:48Can you figure out what's the best strategy for all the students to find their numbers
07:52and win the prize?
08:03This riddle sure isn't obvious, but let's check out how it could work.
08:08If each student searched for their numbers randomly, they would each have a 50% chance
08:13of finding the box with their number inside.
08:16This is so because there were 100 boxes and they were allowed to look inside 50 of them.
08:22However, the probability of all of them finding their own number following this random strategy
08:27is absurdly small.
08:29So to increase their chances of collectively finding their numbers, they would need a better
08:33strategy.
08:36The students could use something called the loop strategy.
08:40Once entering the classroom, they should go directly towards the box that had their number
08:45on top of it.
08:46The number inside probably wouldn't be their number, but that's ok.
08:51They should check the number inside the box and go look for the box with that same number
08:55on top of it, and so on and so forth.
08:59They should keep doing this until they find the slip with their number on it.
09:05This strategy means that 31% of the time, all students would be able to find their number
09:11and win the prize.
09:13It's not a huge probability, but hey, at least they'll have fun trying to figure all of this
09:18out!
