Two brothers, both mechanical engineers, are climbing many of the world’s tall peaks to prove they have been measured ...

From Kazakhstan's vast steppes to Eritrea's Red Sea coast, these aren't your typical geography quiz countries—they're the ...

NBC News is tracking Covid-19, which has killed more than 6 million people worldwide. The daily worldwide death toll is down from its late 2020 peak. Track the latest numbers on how many people have ...