By Stephen A. Marshall
By Gilbert Waldbauer, Illustrations by James Nardi
By Sean Carroll
By Jim Bell
By edited by Diana Donald and Jane Munro
By Douglas Palmer, illustrated by Peter Barrett
By Theodore Cross
By Dominic Couzens
Even at an early evolutionary stage, bird-like dinosaurs occupied different niches in the same ecosystem,
Dung beetles use light from the MIlky Way to find their way
Recently identified subspecies ranges farther than first imagined: across Africa.
An archaeologist ponders the fate of Hoover Dam