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, ...

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 ...

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

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 ...