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Biologists have also found plenty of evidence to support Darwin's other major claim: that different species share a common ancestry. Over the past 15 years, for example, paleontologists have found several fossils of whales with legs, linking modern whales to their terrestrial ancestors. Besides studying fossils, biologists can discover the genealogy of species by looking at their DNA. The fossil record points to hippos and other hoofed mammals as being the closest living relatives of whales. So does their DNA. Our own DNA contains clues to the bonds we share with the rest of life - it turns...
These networks are so intricate that they probably put some limits on evolution's creative potential. Once a lineage of animals evolves networks for arms and legs, it's not easy for evolution to rewire the networks to produce, say, wheels. For one thing, many networks share some of the same genes. A change to a gene that improves one network may wreck another one. So for the most part, we're stuck with what evolution gave...
...This article contains a table. Please see hardcopy of magazine or PDF.] DARWIN TODAY Species share a common ancestry, like branches on a tree Genetic studies confirm that different species have evolved from common ancestors. But DNA has also jumped from one species to another - turning parts of the tree of life into a web Humans evolved from apes in Africa Evidence from DNA indicates that chimpanzees and bonobos are the closest living relatives to humans. Fossils document the course of human evolution in Africa from apelike ancestors over the past 7 million years Natural selection is a powerful force...
...calls a "national unity government that would be founded on the large parties in Israel from both Kadima's left and right." It is a logical option. But Livni lacks support among the other parties. For starters, she needs to coax Netanyahu to join her. The two parties actually share many of the same policies and ideologies - Kadima broke away from Likud and drifted to the center - and, in theory, their combined strength could usher in a solid, center-right government. But the mutual antagonism of both leaders makes an accommodation all but impossible. Netanyahu, for example, refused to debate...
...differences aside. Everyone is hungry. We have to heal our nation by forgiving our brother." Tsvangirai acknowledged that working with Mugabe would be difficult; he could forgive but not forget, he said, "because tomorrow it might happen again." But he insisted that the deal to share power with Mugabe, while "not a perfect agreement," is "still a workable...