At least 4 in critical condition; preliminary evidence indicates gas explosion, city and fire officials say
NASA's Scott Kelly will spend much of a year in space doing experiments to find out what so long up there does to humans
U.S. pilots legally required to disclose mental health issues, expert says, "but, of course, people can lie"
For many, spring cleaning isn't just windows, curtains and carpets -- 51 percent of Americans pay special attention to their desk or home office
Neil deGrasse Tyson doesn't think like the rest of us; here's a glimpse into what excites an astrophysicist
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