Former first lady Nancy Reagan has died at the age of 94, her spokeswoman told NBC News.
An experimental therapy uses a person’s weak immune system to fight deadly blood cancers.
Americans drove more miles in 2015 than any year since the U.S. government started keeping records 45 years ago.
Google’s self-driving car hit a small bump in the road.
A prominent Republican has criticized presidential candidate and billionaire Donald Trump as unworthy of the office of president of the United States.
For the first time, a team of refugees will compete at the Olympic Games.
Trump says he will build a wall between the United States and Mexico.
Some immigrants in the northeastern state of Maine are learning to lose their accents.
Social entrepreneurs – people who create start-up companies that would help the environment, health care or agriculture – are on the rise.
Number six is Brighton, England.