Sirintra Pumsopa

This Is How We Taste Water

Caltech researchers have found a cell response on mammalian tongues that is making them rethink the existence of five taste senses.

Sour taste cells in these mice have been genetically engineered to be stimulated by light. When the mouse is thirsty, it goes to its water source and finds only light — which gives it the sensation of water, suggesting that sour cells mediate the water response. | Oka Laboratory/Caltech