They're pristine, wild and extremely hot -- and not just because of the high temperature and the stunning volcanic landscape with constant little eruptions.

The 2020 Nobel Prize in Physics has been awarded to scientists Roger Penrose, Reinhard Genzel and Andrea Ghez for their discoveries about black holes.

The number of unsafe interceptions between military jets from Russia and the US over the Black Sea has risen in recent months, but the US has vowed to continue operating in the region despite Russian provocations. CNN's Fred Pleitgen gains exclusive access inside one of their surveillance flights.

Russia, France and the United States have called for an immediate and unconditional ceasefire in the conflict over Nagorno Karabakh, an Armenian enclave in Azerbaijan.

Cape Town's reservoirs have topped 100% for the first time in six years, a magnificent change in the "Mother City" compared to its dire situation just two years ago.

• CDC again updates guidance to say Covid-19 can spread by airborne transmission

For a while it seemed like they were friends. Russian President Vladimir Putin, the former KGB spy, had managed to slowly pry away one of NATO's most awkward members -- Turkish President Recep Tayyip Erdogan. The pair seemed always on the phone, Turkey was kicked out of the US-led F-35 program for buying Russia's S-400 air defense missile system, and Ankara seemed suddenly closer to Moscow than the Brussels-based alliance.

The brain cells of a young man who died almost 2,000 years ago in the eruption of Mount Vesuvius have been found intact by a team of researchers in Italy.

The alleged murder of a 19-year-old woman in India's northern state of Uttar Pradesh has led to massive protests across the country. CNN's Vedika Sud reports.