the.com/bitterness
the taste your tongue invented to stop you from eating poison.
survival senseHumans detect bitterness at far lower doses than sweetness.
taste receptorsAbout 25 genes decode bitter; sweet uses just one.
acquired tasteCoffee and beer hijack a built-in warning signal.
hidden everywhereBitter receptors exist in lungs, gut, and sperm.
emotional borrowEnglish uses one word for flavor and grudges alike.