the.com/sour
your tongue's smoke alarm, screaming acid before it can wreck your teeth
acid detectorSour taste literally measures hydrogen ions on the tongue
warning systemEvolved to flag unripe fruit and spoiled food
face reflexThe sour pucker is hardwired even in newborns
saliva triggerSourness sparks the biggest spit response of any taste
craved hardKids tolerate far more sour than adults can stomach