Using myoglobin, physicists have developed a new way to peer into the inner workings of proteins and detect which specific atoms are at work. A cheetah lies still in the grass. Finally, a gazelle ...

A cheetah lies still in the grass. Finally, a gazelle comes into view. The cheetah plunges forward, reaches sixty-five miles per hour in three seconds, and has the hapless gazelle by the jugular in ...