Watch as ice and snow were seen on desert sands in Ain Sefra, Algeria after temperatures fell below zero.

At least four new variants of the coronavirus are keeping scientists awake at night.

Leaders across the globe welcomed the arrival of U.S. President Joe Biden and the end of the often confrontational presidency of Donald Trump.

Swedish activist Greta Thunberg turned 18 on Sunday, and she thanked her fans with a snarky Twitter message about how she was celebrating.

US President Joe Biden's foreign policy to-do list is long, complicated, and may soon hit speed bumps left by his predecessor.

Fallout from the COVID-19 pandemic is threatening plans to retrieve and exhibit the radio that had broadcast distress calls from the sinking Titanic.

Tesla CEO Elon Musk edged past Amazon founder Jeff Bezos to grab the title of world's richest person, according to Bloomberg and other sources.