Makerbot Is Letting You 3D Print With Metal, Limestone And Wood

Makerbot — perhaps the most consumer-friendly of 3D printer manufacturers — is about to go a long way toward turning the tech into something consumers can actually use. Starting late this year, MakerBot is going to let you 3D print with a range of new materials, including composites of limestone,…

Stone-Tipped Spears Pre-Date The Human Race

Spears feel very much like a human weapon of war — so it’s surprising to find out that, in fact, the stone-tipped projectiles pre-date our species by a bewildering 85,000 years.