Science

Coffee's Natural Creamer

Coffee beans are filled with oils that emerge from coffee grounds under high pressure. These oils form the crema - "the frothy stuff" on top of an espresso. In the last installment of Science Friday's series on coffee, food-science writer Harold McGee, author of On Food and Cooking, explains the chemistry of crema.

Where The Whale Sharks Go

A nine-year study tracked more than 800 of the massive and largely mysterious whale sharks. For the first time, researchers have tracked the sharks' far-flung migration and where they may go to give birth.