Wilbur Sargunaraj visits a small house with a thatched roof, a medium-sized house and a "gigantic mansion" in his father's village. Produced by Wilbur Sargunaraj for NPR, John W. Poole and Ben de la Cruz/NPR. hide caption

itoggle caption Produced by Wilbur Sargunaraj for NPR, John W. Poole and Ben de la Cruz/NPR.

Engineering the perfect cookie: You can control the diameter and thickness of your favorite chocolate chip cookies by changing the temperature of the butter and the amount of flour in the dough. Morgan Walker/NPR hide caption

itoggle caption Morgan Walker/NPR