5. Dolphins’ Brains Work While They Sleep
When a dolphin sleeps, apparently only half its brain sleeps with it. So what’s the other half doing? Actually something very useful it seems. No, it’s not figuring out the mysteries of organic chemistry or plotting some awful retribution on human beings for polluting the ocean – it makes sure the dolphin comes up for air while it sleeps so it doesn’t drown. That’s not only pretty useful, but also amazing.
