It's called a "tardigrade" or "water bear". It's just one of many aquatic invertebrates on the planet, but it's unlike any other life form that scientists know of. Less than a millimeter in size ...

Recent research shows that water bears can withstand temperatures as high as 302 degrees Fahrenheit, pressures over 87,022 ...

Tardigrades, sometimes adorably known as water bears or moss piglets, are microscopic animals capable of enduring conditions ...