Nudity Isn't Illegal in National Parks, But Don't Do Anything Weird

Signs prohibiting nudity are posted on San Onofre State Beach trails in North San Diego County, Calif. There's actually no federal regulation against it in national parks, but some states prohibit public nudity, so don't assume you are safe to strip down because you're in a national park. See more

Colombia, Not Finland, May Be the Happiest Country in the World

According to the 2018 World Happiness Report, Finland is the "Happiest Country in the World," making it a Nordic clean sweep five out of the past six World Happiness Reports (Switzerland stole the top spot in 2015).See More

5 Medications Prescribed for Off-label Use

Climate Change Threatens the Moai of Easter Island

Early Humans Witnessed a Comet-scattering Stellar Encounter

Roughly 70,000 years ago, early humans may have looked up in the night sky and seen a bright reddish star flaring up that isn't visible to the naked eye today.Called Scholz's star — after German astronomer Ralf-Dieter Scholz who spotted it in 2013 — it is now nearly 20 light-years away. However, after calculating its speed, distance and trajectory, astronomers have determined that it buzzed the solar system when both early Homo sapiens and Neanderthals roamed our planet tens of thousands of years ago. See more >>