Something unusual sits quietly in central Africa, and it doesn’t look dangerous at first glance. A vast, calm lake stretches ...

Why it's incredible: The lake contains huge amounts of explosive carbon dioxide and methane. Lake Kivu is a giant body of water that is so saturated with carbon dioxide (CO2) and methane at its depths ...

Katie has a PhD in maths, specializing in the intersection of dynamical systems and number theory. She reports on topics from maths and history to society and animals. Katie has a PhD in maths, ...

Lake Kivu is framed by imposing cliffs, nestled within a verdant valley straddling Rwanda and the Democratic Republic of Congo. On the lake, fishermen float out in small boats, singing to time their ...