In tomorrow’s New York Times I write about the afterlife of the greatest medical disaster in history. Thalidomide, a drug women took for morning sickness in the late 1950s, caused thousands of devastating birth defects, such as the failure of limbs to develop. Even after the drug was banned, scientists had no idea how it interfered with growing arms and legs. In fact, fifty years later, they’re only just starting to figure it out.

This was a particularly interesting story to write coming after a piece I wrote for the Times last year about normal limb development.  Now thalidomide is revealing a new player in the limb development game, a protein that no one knew about when I wrote