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Shark Sleep Mystery
- Scientists struggle to determine if sharks sleep because they must swim continuously to breathe.
- A viral video of a seemingly catatonic great white shark sparked speculation, but brain activity remains unknown.
Diverse Sleep Patterns
- Sleep doesn't look the same in all animals, making shark sleep research more complex.
- Some animals don't have REM sleep, so observing stillness or closed eyes isn't enough to confirm sleep.
Frozen Frogs
- Certain frog species freeze solid during winter, stopping their hearts and blood circulation.
- They thaw out without negative effects when temperatures rise, a process still largely unexplained.