DNA analysis reignites fierce debate over fate of 9,000-year-old skeleton. Genome sequencing indicates Kennewick Man is Native American, reopening the bitter battle over whether he should be reburied or studied.
How snakes lost a blueprint for making limbs. When researchers inserted the snake DNA into mice, the animals developed truncated limbs, suggesting that a critical stretch of DNA lost its ability to support limb growth during snake evolution. Snakes lost their limbs over 100 million years ago, but scientists have struggled to identify the genetic changes involved.