Yams are considered one of the world’s most important crops. A starchy, nutrient-rich root vegetable of the genus Dioscorea, ...

The pong pong tree—also known as the “suicide tree”—may be a plot point in the season finale of the HBO series. But the plant was known to cause thousands of deaths a year in the past.

The volcanic island of Bioko, about 160 kilometers, or 100 miles, northwest of mainland Equatorial Guinea, is carpeted in ...