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Science brain teasers require understanding of the physical or biological world and the laws that govern it.


Puzzle ID:#9433
Fun:*** (2.39)
Difficulty:* (0.9)
Submitted By:Julia***
Corrected By:Winner4600




Dan and his best friend Dave were out fishing when they noticed a shark circling their dinghy. Whenever they tried to move the boat, the shark would barge into it, nearly causing it to capsize. "Never mind," said Dan. "If we wait long enough, it'll get tired, and while it's asleep we can sneak away."

Was this good advice?

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Jan 11, 2003

I thought they did...just with their eyes open.
Jan 16, 2003

Don't they get tired? Maybe we should stop dumping caffeine into the ocean.
Jan 19, 2003

Julia's right. Sharks don't sleep because if they did they would sink to the bottom of the ocean/sea that they are in and are unable to get up, They then starve to death if they don't find enough scraps to survive. Great teaser.
Jan 29, 2003

Actually, while it is certain that they have to keep moving (except for nurse sharks, which have a special mechanism around their eyes to pump water to their gills), it is still deabted whether the sharks sleep or not. It is certain that they go into a deep rest phase, in which they still move instinctively.
Feb 23, 2003

way too easy, at least to me
Feb 24, 2003

Throw some chum Dave
Jun 20, 2003

When you say "sneak" didn't you mean walk? I mean you are in the middle of the sea, you can't sneak away, you would "row" away in the boat?
Oct 25, 2003

lol, I guess I don't know much about sharks, do I?
Aug 01, 2004

I would like to know why Dan and Dave were fishing in shark infested waters in just a dinghy?
I zero'd in on the answer without swimming around any.
Jun 11, 2005

Thanks, I learned something.
Jan 19, 2006

actually sharks, like many other fishes, do "sleep" though they don't lose consciousness. Instead, one half of their brain sleeps at a time, in a sort of "keeping watch" system.
Jul 20, 2006

This was in a Mensa puzzle book... verbatim.
Sep 02, 2006

That's a negative. Studies have shown that some species of sharks DO sleep, including the nurse shark
Jun 14, 2007

Though the shark will realize the boat is not food and lose interest very quickly to find real food (sharks don't even like human taste, which is why there are no documented cases of a human actually being eaten, only bitten and sometimes fatally). It is very good advice to say "wait."
Sep 22, 2009

Sharks DO sleep, but here's an interesting fact for you: Sharks never suffer illnesses of any sort. Great Job!

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