Can you solve the bridge riddle? - Alex Gendler

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Published 2015-09-01
View full lesson: ed.ted.com/lessons/can-you-solve-the-bridge-riddle…

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Taking that internship in a remote mountain lab might not have been the best idea. Pulling that lever with the skull symbol just to see what it did probably wasn’t so smart either. But now is not the time for regrets because you need to get away from these mutant zombies...fast. Can you use math to get you and your friends over the bridge before the zombies arrive? Alex Gendler shows how.

Lesson by Alex Gendler, animation by Artrake Studio.

All Comments (21)
  • @Borednesss
    Well you don't have to cut the bridge.. it'll collapse from the zombies.
  • "The old professor takes 10 minutes and you have 17" Guess who's the newest member of the zombie crew
  • @Aussiesurti
    Step 1: tell the zombies one of them have green eyes. this will buy you enough time to cross the bridge regardless of what strategy you want to use as long as it's one hour.
  • @cherribomb3707
    I would probably spend the whole 17 minutes thinking how to cross the bridge 🤣
  • @ngchorhong3174
    I find it absolutely HILARIOUS they had to remove befriend the zombies as an option just to shut the trolls up
  • I figured it out myself.  The problem was, it took me six minutes to figure it out!  So me and the lab assistant went across first, kept running, and made a pact never to speak of this event again.
  • @nishika9094
    I'm so proud of myself for finally solving a TED-Ed riddle, and actually doing it on paper and thinking it out.
  • This riddle is unironically has scared me more than any horror movie. The visuals and music is just so unsettling. I couldn't turn corners in fear of the zombies when I was younger.
  • My teacher showed this riddle to my class and half the kids were saying "SACRIFICE THE PROFESSOR!"
  • @inmyflopera729
    As soon as I heard that the professor takes 10 mins...... SACRIFICES HAVE TO BE MADE Lmao
  • @emmie1210
    My teacher did this riddle, and there were so many unique answers Niamh: “Well they didn’t say you couldn’t sacrifice anyone…” Millie: “use the boast as a raft” Annie: “the professor stays on the other side with the lantern and knocks out the zombies with his cane, then walks across” Beth: “cut open the lantern, start a fire, and burn the zombies to a crisp.”
  • @ThyStare
    And as you hand the lantern to the janitor and he and the professor vanish through the darkness crossing the bridge you hear the professor's voice shouting from a distant spot: "Did I say seventeen? sorry, I meant seven"
  • @zynyie
    This is so nostalgic. I was a kid when I first watched it and I had nightmares but looking back, I’ve seen scarier lol. Thank you for a good riddle and my kid nightmare fuel.
  • @nadiabouk8712
    Ted Ed: “You can’t swing across-“ Me: “Oh yes I can”
  • @gogga6902
    “We have seventeen minutes before the zombies arrive” takes twenty years to calculate a plan
  • @flameshard8748
    The zombies In this riddle used to terrify me as a kid lol