Scientists fear not enough is being done to study long-term effects of radioactive contamination from the nuclear disasters at Chernobyl and Fukushima Daiichi.
Researchers have developed complex human brain tissue in a 3-D culture system that allows pluripotent stem cells to develop into cerebral organoids - or "mini brains" - that consist of several discrete brain regions.
As of August 28, the fire is 20% contained. Thousands of firefighters are still battling the blaze, which has burned 184,481 acres near Yosemite National Park.