The function of early hominins’ enlarged brow ridges, and their reduction in size in Homo sapiens, have puzzled paleoanthropologists for decades.

The chelicerates’ unique anatomical features make them useful analogs to extinct arthropods.

This 10-centimeter-wide pig eye replica includes even the most intricate of blood vessels, some no wider than 30 micrometers.

A novel contrast agent capable of staining the finest blood vessels reveals an elaborate, entwined network in this pigeon’s CT scan.