People have a surprising number of rare genetic variants
If variety lends life flavor, then humans are kicking things up to a previously unrecognized notch on the spice-o-meter.
New efforts to decipher the genetic blueprints of thousands of people have turned up more than half a million tweaks in human DNA, many more than scientists expected. Most of these tweaks are new to science, and a majority fall into a class called “rare variants,” found in 0.5 percent of the population or less. S