Komodo dragon teeth are ironclad. For real. These animals — the largest living lizards — have razor-sharp teeth. What’s more, a layer of iron lines the tips and saw-like edges…

Four thousand years ago, the world’s last woolly mammoth took its final breath. But the reason for that may not be what many scientists had long suspected. The last of…

Cosmic rays (noun, “KOZ-mick rayz”) Cosmic rays are high-energy particles that zoom through the cosmos. Most of these particles are protons. Others are proton-neutron clusters, or atomic nuclei. They race…