Not all the women who have a family history of breast cancer wind up carrying a gene that causes the disease.

FORBES: Old Breast Cancer Drug Brings in New Money

The Fujita scale is used to estimate the wind speed of a tornado by the damage the tornado causes.

CNN: Tornadoes Fast Facts

They will focus on the places above the poles where the wind pierces the earth's magnetic defences and causes, among other things, the shimmering lights of the aurora borealis and aurora australis, and interference with radio communications.

ECONOMIST: Birds of a feather