World knows presumed ISIS executioner's name, but not what drove him to radical Islam, or why he wasn't stopped
Concrete homes offer several advantages over traditional materials, are gaining popularity -- and can actually be quite cozy
Much of the Department of Homeland Security will shut down at midnight unless Congress resolves disputes over immigration and extends funding
Nimoy, who played Mr. Spock on "Star Trek," was known for the catchphrase "live long and prosper"
"60 Minutes" takes a look back at his death and a rare interview that led to an admission connected to his murder
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