Scans tell gripping tale of possible ancient tool use
Fossils contain inner signs of humanlike hands nearly 3 million years ago
ADVANCE HAND High concentrations of spongy inner bone in an ancient hominid’s knuckles and thumb base (indicated by arrows, red indicates more spongy bone) suggest humanlike hands evolved nearly 3 million years ago.
M.M. Skinner et al/Science Vol. 347, issue 6220 (2015)