Ever fancied becoming a real-life spy? Or maybe an astronaut? Or perhaps you want to work for one of the
biggest IT corporations in the world? Then you’ve got a chance to test your mettle
and see if you’re witty enough for any of these jobs! The spy riddle
British National Cyber Security Centre, or NCSC, disclosed a riddle for their potential
high-profile employees some time ago. If you’re able to solve it, then your mental
abilities are enough for you to become a cyber-spy! Let’s check it out, shall we? The riddle goes as follows: “Thirteen rotters
stole my answer and they ROTated it by 4 and then ROTated it by 10 and all I have left
is Uccr ziqy hc ozz QmpsfTwfgh Uwfzg! — (well you can read this for yourself). Can you help me get my answer back?” Everything in this riddle is right where it
should be; there are no mistakes or typos, so take your time and try to solve it yourself. Don’t be in a hurry — just pause the video
if you don’t want to see the answer right away and turn it back on when you’re ready
to check yourself. I’ll wait right here, don’t you worry. So, you’re here again, and I take it as
a cue to start my explanations. But first, I’ll give you a little hint:
the riddle uses the so-called “Caesar cipher,” which scrambles the letters in a certain system. You’ll need to toss them around (like a
Caesar salad) c using the alphabet, that is, each letter is shifted to a number of positions
back in the alphabetical order. For example, if the key is 5, then F will
move 5 positions down and become A, and so on. Got it? Then why not try again if you didn’t manage
to nail it on your first attempt? I’ll wait here again! Okay, now the games are over and we’re heading
straight to the solution, so listen up. First, fetch the alphabet on the Internet
or just write it out. Now look at the first letter in the code message. The riddle says that the rotters ROTated the
answer by 4, so make it 4 positions down the alphabet and you’ll get Q. Then it says
they ROTated it again, this time by 10, so without any complex ideas just count down
10 more positions, stopping at G. This is your final point for this letter. Then do the same operation with each of the
letters, and you’re cool as cucumbers! In the end, you should get the following phrase:
“Good luck to all CyberFirst girls!” Not that hard, if you think about it, but
only if you had the key from the start. If you didn’t listen to my hint and still
managed it on your own, you deserve a double praise — you’d definitely do well in a
cyber-intelligence test! Now, the “thirteen rotters” and the capitalized
letters ROT might’ve confused you, but they’re simply a distraction: it’s a reference to
ROT13 — another cipher that switches letters with those 13 positions up the alphabet. Feeling good about yourself yet? Well, it gets better! Here we go… The astronaut riddle
Tim Peake, a British astronaut, posted a puzzle on his Facebook page, claiming it was from
the test he had taken himself when applying for a position in NASA. Obviously, he’d solved it, but can you repeat
his feat? Let’s find out! Imagine you’re facing a cube. It can roll to the left, right, forward (towards
you), or back (away from you). On the bottom of the cube, there’s a dot. Now roll the cube forward, left, left, forward,
right, backwards, right. Where’s the dot now? Again, don’t be in a rush and pause the
video to visualize the whole thing carefully. You’re applying for an astronaut, for cake’s
sake! If you’re hearing me now, then you’ve
probably solved the puzzle or are just waiting for the correct answer. Either way, here it is: the cube will end
up in exactly the same position it started from, so the dot will be on the bottom. Check it out for yourself if you don’t believe
me! Okay, ready for some other kind of mind-bending? Here goes… The Facebook interview riddle
If you ever wanted to work for the social media giant, check out the question they used
to ask their candidates at an interview. Would you be able to pass the test? You’re about to board a plane to Seattle
and you’d like to know if it’s raining there. You call three friends from the city and ask
about the weather. Each of them has a 2/3 chance of telling you
the truth and 1/3 chance of lying to mess with you. All three of them tell you that it’s raining,
though. What is the chance that it’s actually raining
there, considering that neither of the three knows the others? It’s more of a mathematical problem, but
it’s how Facebook tests their future employees, so turn on your math brain! Ready? Then I’m going forth with the answer. You could guess all you like about the odds,
but the easiest way to find them out for sure is to add them up. Suppose all three friends lied to you. The probability of that will be 1/27, that
is, 1/3 multiplied by 3. That will be the chance of it not raining
in Seattle because all of your friends told you it was. So the probability of it actually raining
is 26/27, or 96%, and it could only happen if at least one of them told you the truth. So did you get this one right? Let me know down in the comments! And next up is… The Google interview riddle
If your brain is ringing from all the math stuff, relax — this one doesn’t have to
do with any calculations. But it doesn’t mean it’s simple! So listen up. Why are manhole covers round? If you can give the answer right away, then
just continue watching this video! Ready to check your guess? Good! They’re round for two reasons: first and
foremost, a round manhole cover will never fall into the hole, whatever side you put
it down. And secondly, it’s easier to roll to the
site. But even if you only guessed the first part,
you’d already land the job at Google! Congrats! Going to the next one… The Apple interview riddle
Now this puzzle is going to blow your mind, but don’t get too rough on yourself — after
all, it’s not like you’re gonna really get the job at Apple after solving it, right? Anyway, here’s the deal. There’s a table with 100 coins lying on
it. 10 of the coins are heads up, while the rest
of them are tails up. You only know it, though, but can’t see,
feel, or find out in any other way which ones are flipped. Your task is to split the coins into two piles
so that there’s the same number of flipped coins in either pile. Remember, you have all time in the world if
you just pause the video to think. So, did you get it? Even if not, I’m gonna explain this to you. You know why it’s mind-blowing? Because it’s so simple you won’t believe
it. You just need to take any 10 coins from the
table — and I mean any, — make a separate pile of them, and flip them. That’s it, you’ve solved the puzzle. It doesn’t matter if there’s one or two
heads-up coins in your second pile or not. In fact, it doesn’t matter which coins you
chose in the first place. If you take them from the initial hundred
and flipped them, you’ll get two piles with the same number of heads-up coins in both,
no exceptions. Wanna check it out for yourself? Just try! If you’ve finished experimenting, then there’s
the last riddle waiting for you. Ready? The LinkedIn interview riddle
This one is probably the most difficult, and I don’t expect that you’ll give the correct
answer. You’ve been warned. So the question is… How many golf balls would fit into a Boeing
747? Do you know the solution? If you need time to think, you know what to
do. And if you don’t want or need any time here,
I understand you perfectly: it seems simply unfair to ask such a question. And it actually isn’t! You see, if you’re asked something like
this at a job interview, there’s a catch: the hiring manager doesn’t expect you to
give a definitive answer. In fact, they might not know it themselves! What they need is to see your brain at work. So if you eventually find a solution, make
sure to share it in the comments with all the reasoning and calculations behind it! After all, they’re the most valuable asset
in this test! Hey, if you learned something new today, then
give the video a like and share it with a friend! And here are some other videos I think you’ll
enjoy. Just click to the left or right, and stay
on the Bright Side of life!