Tardigrades can enter a suspended state called cryptobiosis to survive extreme heat, cold, pressure or radiation. A new study of tardigrades preserved in amber suggests this ability evolved about 300 million years ago and let them survive the Permian extinction & isn't science fun?!?!?!?! https://www.scientificamerican.com/article/tardigrade-fossils-reveal-when-water-bears-became-indestructible/