Can you solve the private eye riddle? - Henri Picciotto

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As Numberland’s best detective, you thought you’d seen it all. But the desiccated corpses of prominent natural numbers have been showing up all over the city. A lockdown is ordered from sundown to sunrise, and it’s still not enough to stop what can only be described as a vampiric feeding frenzy. Can you figure out why the citizens of Numberland are being attacked? Henri Picciotto shows how.

Lesson by Henri Picciotto, directed by Igor Coric, Artrake Studio.

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Notice how the two characters are a pie (π, probably the most famous irrational number) and an eye (i, an imaginary number). Brilliant.

antonioarcudi

one of the strangest riddles ive seen on ted ed, but one of the only ones ive gone through smoothly without any trouble!

jibberwocky

4:45 I love how 45 is casually walking his asterisk.

mysticalmagic

The best part of the video is when they "round up" the vampire with the ceiling function

zjefvaneetvelde

Literally the only riddle I got all the correct answers to. My confidence in my math skills is restored!

faithdecoteau

If it wasn’t for the starting quote, I wouldn’t have been able to solve it. I actually felt really good realizing that only prime numbers were slimed and the healthy digits were primes!

Penguinmanereikel

What I'm confused about is why 461 had slime between 4 and 6. Take that out, and you get 46 and 1, which still leads to all three digits getting drained. I'd figured out the "primes don't get drained" part, and "slime allows non-prime digits to be isolated in otherwise prime numbers" bit, but the extra slime between 4 and 6 was leading me to believe the slime had some other purpose as well.

MisterVercetti

I really liked the wordplay in "They round him up", using the mathematical rounding function as his prison.

illusion-xiii

"Round him up". Would have been funny if the vampire was a number itself and there were clues to reveal its identity.

nunyabiznes

I just saw a riddle coming on youtube and I'm like 'yay! a new riddle!' Thanks a lot for giving us new riddles TedEd!

thecoreproject

The visual pun on 'round him up' killed me. 😭

Stickycomix

The animation team of TED deserves a raise!

bruhh

Before I try to solve it, I love how the P.I. is actually a pie (and pi). And the other P.I. is an actual eye (or maybe i for imaginary number. If that's wrong, I haven't been in a math class in a very long time)

Matthew-lmyc