Dr. Jason Karlawish is a professor of medicine at the University of Pennsylvania. He says the most significant breakthrough in Alzheimer's research is that doctors no longer have to wait until after a patient has died to diagnose the disease.
This is WEEKEND EDITION from NPR News. I'm Lynn Neary. Two years ago, 90 percent of kids playing with Legos were boys. You heard that right. Nine-zero. That's partly because Lego had turned from gender neutral buckets of bricks to selling heavily franchised sets such as "Star Wars" or "Avengers." For our series about kids and culture, NPR's Neda Ulaby looked at Lego's recent gamble on girls.
This is WEEKEND EDITION from NPR News. I'm Lynn Neary. President Obama is in Johannesburg, South Africa this morning. It's his second stop on a three-country tour of Africa. NPR's Ari Shapiro is traveling with the president. He joins us now. Good morning, Ari.
ARI SHAPIRO, BYLINE: Good morning, Lynn.
NEARY: The president held a press conference with the current South African president Jacob Zuma this morning. Tell us about that.