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.
Looking at Mars' dusty, dessicated landscape, it's hard to believe that it once possessed a vast ocean. A recent NASA study of the Red Planet using the world's most powerful infrared telescopes clearly indicate a planet that sustained a body of water larger than the Earth's Arctic Ocean.
Deuterium is a rare variation of hydrogen. For such a small object, it's incredibly informative. Here's how deuterium can let people track your your diet, your area, and your season.
Where Earth got its oceans is a big question, and the currently preferred explanation is that ancient comets brought in huge amounts of water from the outer solar system. That hypothesis just received some big evidence to back it up.