The term "regeneration" in biology can refer to the regrowth of a severed limb in some animals, but it's not a simple process; the complexity varies wildly, even between closely related species. Some salamanders regrow limbs perfectly, while others can only manage a less-functional stump. elaborate
Your body produces enough saliva in a lifetime to fill two swimming pools. elaborate
Some extremophiles, like tardigrades (water bears), can survive the vacuum of space. elaborate
Gene editing techniques like CRISPR-Cas9 were originally inspired by bacterial defense mechanisms against viruses. elaborate
