Finally this hour: Your letters. We heard from Aaron Berger, a high school biology teacher in Minneapolis. He listened closely to our conversation this week about mitochondrial DNA. A debate is raging over whether women who want to have children but have errors in their DNA should be allowed to get a healthy transplant.
California is getting some much needed rain this week, but more than two-thirds of the state is still in extreme drought conditions, and that has the state thinking about alternative ways of getting water.
On the coast in Carlsbad, Calif., construction workers are building what will be the largest seawater desalination plant in the Western Hemisphere. When finished in early 2016, it is expected to provide up to 50 million gallons of fresh drinkable water every day.