Here’s the story of how scientists unlocked the secrets of the worst natural disaster in the history of the West African nation of Cameroon… and what they’re doing to try and stop it from happening again. (More below the break)

On the morning of August 22, 1986, a man hopped onto his bicycle and began riding from Wum, a village in Cameroon, towards the village of Nyos. On the way he noticed an antelope lying dead next to the road. Why let it go to waste? The man tied the antelope onto his bicycle and continued on. A short distance later he noticed two dead rats, and further on, a dead dog and other dead animals. He wondered if they’d all been killed by a lightening strike – when lightening hits the ground it’s not unusual for animals nearby to be killed by the shock.

Soon the man came upon a group of huts. He decided to see if anyone there knew what had happened to the animals. But as he walked up to the huts he was stunned to see dead bodies strewn everywhere. He didn’t find a single person still alive—everyone in the huts was dead. The man threw down his bicycle and ran all the way back to Wum.

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