Indeed, the mutants were no more interested in a dilute sugar solution (or, indeed, a solution of artificial sweetener) than they were in plain water though they did respond to concentrated solutions of sweetness.

ECONOMIST: Hormones influence how sensitive taste buds are to sugar

As every schoolchild should know, water moves from a dilute to a concentrated solution through a semipermeable membrane by a process called osmosis.

ECONOMIST: Fish genetics