Chirality is a property where something exists in two forms that are mirror images of each other, like your left and right hands. Hold your hands up and look at them: they have the same basic structure (five fingers, a thumb, a palm), but they're not identical. Your right hand can't perfectly overlap your left hand. They're mirror images, and that's what chirality is all about.

Scientists use chirality to describe molecules that come in two mirror-image versions. These molecular twins are called enantiomers. Just like you can't fit your left hand into a right-handed glove no matter how you twist it, one version of a chiral molecule can't transform into its mirror image without breaking and reforming chemical bonds.

Chirality matters enormously in chemistry and biology. Your body is extremely sensitive to molecular handedness. For example, one mirror-image version of a molecule might smell like spearmint while its twin smells like caraway seeds. Some medicines only work when they have the correct chirality: the right-handed version might cure a disease while the left-handed version does nothing or even causes harm.

Many everyday objects show chirality: spiral staircases, screws, baseball gloves, and seashells. A right-handed spiral can't become a left-handed spiral just by rotating it. When something and its mirror image can't be superimposed (matched up perfectly), that object is chiral.