The science behind our sense of taste; carbon sequestration; evolutionary roots of human language; profile of medical engineer Sangeeta Bhatia.

The science behind our sense of taste; a product that may fulfill the dream of creating an artificial tree that can absorb carbon dioxide directly from the air; shedding light on the evolutionary roots of human language through studies of walrus and sea lion vocal and intellectual abilities; and a profile of medical engineer Sangeeta Bhatia.