LifeMothering matters, but grandmothering counts too Grandmothers stick around to protect the DNA they share with their grandchildren, new evidence suggests 51¶¯Âþ
HumansOur ancestor Ardi walked tall The bones of a 4.4-million-year-old relative suggest that she walked upright. See more family snaps in our Gallery 51¶¯Âþ
LifeReview: Comets and the Origin of Life by Janaki Wickramasinghe, Chandra Wickramasinghe and William NapierBooks & Arts