A version of this story appears in the February 2017 issue of National Geographic magazine. Citrus, in many ways, stands alone. So many cultivated species have come from so few primary ancestors.

Researchers in New Zealand found that a small species of shark makes noises with their teeth when touched by humans — and now ...

The giant extinct shark species known as the megalodon has captured the interest of scientists and the general public alike, ...

Some of Lemon fruits at Ahmed Abdirahman Hassans farm in Mandera county. [Beverlyne Musili, Standard] Lemon farming is a lucrative agribusiness due to the high demand for lemons in both local and ...