Should we resurrect extinct species?

Woolly mammoths stomp through the Siberian tundra as the giant moa strides the forest floor of New Zealand and Tasmania’s dog-like “tigers” stalk their prey under the cover of night. This is not a snapshot of times past, nor next year’s sequel to Steven Spielberg’s “Jurassic Park.” Instead, it is a scenario that some biogeneticists … [Read the full story]