"There's a disconnect between the facilities available to people and the demand for them, " says Ian Goldin, a professor of globalization and development at the University of Oxford in England.

WSJ: Hoteliers Race to Expand in Africa

"Sheryl is saying that women aren't, for some reason, allowing themselves to get to the top, " says Ms. Goldin, who has studied women's changing roles in the economy.

WSJ: The Economics of Leaning In

"We've always flown astronauts between the ages of 30 and 60, " says NASA administrator Daniel Goldin.

CNN: Victory Lap