Sheep use their brains to avoid dehydration. A new study shows they can dramatically reduce water loss by using their brain's built-in heat exchange system to cool down their blood. When sufficiently calm, sheep can save up to 80% of daily water intake by using this method.
If you ask people why they yawn, the most typical answer will be "because I'm tired." But sleepiness and boredom might not be the real reasons behind yawning. It actually might be a way of getting rid of hot air.
Scientists have found the reason why our body temperature is 98.6° Fahrenheit (37°C). Apparently it's the perfect balance, as it's warm enough to prevent fungal infection but not so hot that we need to eat nonstop to maintain our metabolism.