Officially known as
tardigrades, these microscopic relatives of insects are tiny, squishy, and really cute--but don't let their chubby exteriors fool you. These creatures may be the toughest things on the planet. When faced with drought or cold weather, water bears will curl up, lose 97% of their body fluids, and "die". They can survive this way for
years before emerging when times are better, completely unharmed! Nobody is sure how they do it, but in their "suspended animation", water bears can survive temperatures between absolute zero and the boiling point of water, and even the vacuum of space!