New research suggests that hair diameter increases through a person's mid-30s, compensating for the gradual loss of active hair follicles.

WSJ: Old Hair Days: Products to Help Manage Gray and Thinning Hair

Atrial fibrillation is the most common heart rhythm disturbance, with over half a million sufferers in the UK. It increases the risk of a person having a stroke by five times and doubles the risk of death.

BBC: Pioneering robotic arm operation at Glenfield Hospital

Yet keeping the smallpox around dramatically increases the risk that a deranged person will get his hands on it and release it in the population.

FORBES: It's time to destroy the U.S. smallpox reserves

And once a reverse mortgage is taken out, it increases the person's income, which may have a negative impact on Medicare nursing home payments, Holland says.

FORBES: Intelligent Investing Panel

Mr. Cohen's political shift was driven in part by his concern about increases in government spending and deficits, said a person close to him.

WSJ: Financiers Switch to GOP

Commensurate with the higher risks for natural disasters in the U.S., rate rises below 10% should at least be on the cards, with double-digit-percentage increases in some loss-affected areas, said a person familiar with the matter.

WSJ: Sandy's Insurance Bill Estimated at $25 Billion for Industry

According to the data, if a person becomes obese, the likelihood that one of his or her friends will become obese increases by 57%.

WSJ: Our Social Networks, Ourselves