News
- Health & Medicine
U.S. breast-feeding rates up
Between 2000 and 2008, the fraction of women breast-feeding babies increased, as did the fraction breast-feeding for a year.
- Humans
In research, it matters whether you’re a man or a mouse
A study that compares trauma responses of mice with those in people questions the relevance of mouse research to human disease.
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- Life
Ancestors of today’s placental mammals may never have shared the Earth with dinosaurs
A newly constructed family tree dovetails with the fossil record, but differs considerably from previous genetic studies by suggesting that placental mammals emerged after the dinosaur extinction.
