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Welcome to Science Fiction, where you ask questions about science... | 0:03:03 | 0:03:07 | |
That we can get our teeth into. Come back here, you. Come here! | 0:03:07 | 0:03:11 | |
BUD E, what've you got for us? | 0:03:11 | 0:03:14 | |
HE SNORES | 0:03:14 | 0:03:15 | |
Oh! Sorry, Chief. | 0:03:15 | 0:03:17 | |
I was in sleep mode there. | 0:03:17 | 0:03:19 | |
Today's question comes from Victoria in Pretoria. | 0:03:19 | 0:03:23 | |
Is it true that sharks don't sleep? | 0:03:23 | 0:03:25 | |
Sharks have gills on the side of their bodies | 0:03:25 | 0:03:28 | |
which extracts oxygen from the water. Most species | 0:03:28 | 0:03:31 | |
stay on the move to keep water flowing through them. | 0:03:31 | 0:03:34 | |
That means they can't fall asleep like we do. | 0:03:34 | 0:03:37 | |
I find if you can't sleep, a cup of cocoa | 0:03:37 | 0:03:40 | |
and counting sheep is your only man. Argh! | 0:03:40 | 0:03:45 | |
Some scientists believe sharks can shut down parts | 0:03:45 | 0:03:48 | |
of their brain, which allows them to rest, but still keep moving. | 0:03:48 | 0:03:52 | |
A bit like me doing this show. | 0:03:52 | 0:03:54 | |
But while in this semi-conscious state, they're unlikely | 0:03:54 | 0:03:58 | |
to engage in anything too active, such as hunting, feeding... | 0:03:58 | 0:04:02 | |
Aerobics, line dancing, volleyball... | 0:04:02 | 0:04:05 | |
It's hard to tell if a shark's resting as their eyes don't close. | 0:04:05 | 0:04:09 | |
Well, I've a way of finding out, but I wouldn't recommend it. | 0:04:09 | 0:04:13 | |
Sharks don't sleep like humans, but they have their own way of resting. | 0:04:13 | 0:04:18 | |
It doesn't involve pyjamas and hot water bottles. | 0:04:18 | 0:04:21 | |
So that's just a load of old science fiction. | 0:04:21 | 0:04:23 | |
# Science fiction. # | 0:04:23 | 0:04:26 | |
That was a nice, snappy episode there, Dr Knowles. | 0:04:26 | 0:04:31 | |
We'll be able to get the early bus home now. Catch Corrie. | 0:04:31 | 0:04:35 |