Author

Sean O'Donnell

Sean O’Donnell is Professor of Biodiversity, Earth, and Environmental Science and Biology at Drexel University. He writes frequently for Natural History.

Recent Stories

The way they live, the food they eat, and the effect on us

A true but unlikely tale

Story and Photographs by William Rowan

Increasing day length on the early Earth boosted oxygen released by photosynthetic cyanobacteria.

Genomic evidence shows that Denisovans and modern humans may have overlapped in Wallacea.