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From the oldest human fossils outside of Africa to ancient fingerprints, here are five amazing archaeological finds from the past five years.

She posted a photo of her holding a plate with a ham and cheese sandwich. "I made you a sandwich ... now ski 37 days and 600 km to the South Pole and you can eat it."

A scientific breakthrough. A water crisis. A classic sitcom returns. What do you remember from the week that was?

Six years after shutting down its solar energy arm, BP has announced a $200 million stake in Lightsource, Europe's largest solar development company.

See CNN's Carlos Slim Fast Facts for a look at the life of the billionaire executive.

In Cape Town, South Africa, they're calling it "Day Zero" -- the day when the taps run dry.

The Humanity Star is orbiting Earth every 90 minutes.

German tech company Sonnen is creating a unique battery able to store renewable energy for residential communities.

President Donald Trump arrived in Switzerland on Thursday, where he'll meet global players and heads of state two weeks after he reportedly used a vulgar word to describe African nations.

With 13 Nobel Prize winners among its alumni, the Science Talent Search isn't your average competition.

Just before jetting off to Davos, President Donald Trump stopped by a sit-down that chief of staff John Kelly was having with reporters -- and immediately started talking.

Scientists in Germany are creating a machine which mimics the reactions at the sun's core to produce clean, limitless energy.

Glenn Selig, spokesman for Trump campaign adviser Rick Gates, was killed in the weekend Kabul hotel attack, according to a statement from spokesperson for The Publicity Agency and Selig Multimedia Inc., his Florida-based companies.

Eight-year-old Ayhem loves America, speaks perfect English and says he wants to be "an American man" when he grows up. However, this Iraqi child's love for the United States comes from the darkest of places: Raqqa, where for three years, he was raised by an American ISIS wife.

Hong Kong needs to do more to combat North Korean smuggling and money laundering in the city, a top US official has warned.

President Trump will meet with business leaders in Davos, Switzerland, while rubbing elbows with some of the global elite he has repeatedly railed against. CNN's Alex Marquardt has more.