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- Health & Medicine
Take a nap
A nap is the most effective way to combat an after-lunch slump, but caffeine will help too.
- Paleontology
Ancient burrows
Triassic-era sediments unearthed in Antarctica reveal the well-preserved lair of a four-legged, mammal-like reptile.
- Paleontology
A mammoth divide
Woolly mammoths roamed Siberia in two distinct clans, and the split between the groups, scientists say, is surprisingly deep, occurring more than 1 million years ago.
- Health & Medicine
Sun up
Men with lower concentrations of vitamin D have higher risk of heart attack.
