A mutation is a change in the genetic instructions that living things inherit from their parents. Every organism carries DNA, a molecular code that determines traits like eye color, height, and countless other characteristics. Sometimes that code gets copied slightly wrong, like a typo in a recipe, and that's a mutation.

Most mutations are tiny and don't matter much. You probably have several mutations that make you slightly different from your parents, but you'd never notice them. Some mutations, though, can be significant. A mutation might change an animal's fur color, helping it blend into new surroundings. Some mutations cause diseases, while others might help an organism survive better in its environment.

Scientists who study mutations have learned fascinating things. For example, a mutation gave some people the ability to digest milk as adults (most mammals lose this ability after childhood). Another mutation helps people living at high altitudes process oxygen more efficiently.

In science fiction stories, mutations often create dramatic superpowers overnight, but real mutations usually have smaller effects and spread through populations over many generations. Over millions of years, countless small mutations, combined with natural selection, have helped living things adapt and evolve. The mutation that helped ancient wolves become friendlier toward humans eventually gave us dogs. Without mutations, life on Earth would never have developed its incredible diversity.