Curious deposits on Mars that originally appeared to be signs of an ancient ocean were instead produced by water emerging from underground, experts say.
The program offers the biggest science prize in history to anyone who can come up with a commercially viable system for removing human-produced carbon dioxide (CO2) from the atmosphere.
an unregulated biofuels boom in Brazil could mean bust for the Amazon rain forest and a vast savanna ecosystem known as the Cerrado, environmentalists warn.
The uncommon DNA, a chromosome called hgA1, had previously been detected only in a region of West Africa. This type of Y chromosome was discovered in England.