Talk of the Nation

Though the Chevy Volt and Nissan Leaf entered the market to fanfare, the battery-powered cars haven't been selling as quickly as hybrid models such as the Toyota Prius. Industry experts discuss electric car technology, from batteries to charging stations, and what it might take to encourage drivers to make the shift.

A new romantic comedy opens in theaters this week, and it stars a scientist as the likeable, and only slightly nerdy, main character. The film's writer and director, former scientist Valerie Weiss discusses Losing Control, and why she made the shift from lab bench to big screen.

As part of an NIH-funded project, Bradley Smith, associate dean for creative work, research and graduate education at the University of Michigan, posted a collection of optical images and MRI scans of human embryos to the web. Intended for a clinical audience, Smith talks about the unexpected response he got from the public.

At age 11, actor Alan Alda asked his teacher what a flame was. He received a confusing answer: "oxidation." In the spirit of better communicating science, he's created the "Flame Challenge," a contest in which scientists do their best to define a flame. Eleven-year-olds from around the world will judge the entries.

Transcript

IRA FLATOW, HOST:

Like many grade schools, a growing number of universities are turning to standardized tests to measure students' educations. Advocates say they are an important tool to help gauge what students learn. Critics insist no single exam can ever accurately measure the value of four years of college.

A NATO ally with close ties to the West, Turkey's economy has grown significantly, and the government of Prime Minister Recep Tayyip Erdogan has taken active roles in several international crises. But reporter Dexter Filkins paints a complicated picture of Erdogan under threats of coup and paranoia.

Nearly a month after 17-year-old Trayvon Martin was shot and killed in Florida, the widespread shock and outrage has grown into a nationwide movement calling for justice. This week, the Justice Department announced it would conduct a federal investigation of the incident.

But the Trayvon Martin story has also turned into a dialogue about race in America, a conversation that NPR's Michele Norris has been engaged in for over a year with her Race Card Project.

A pair of new studies find that taking aspirin daily may significantly reduce the risk of many cancers and prevent tumors from spreading. Many experts view the findings as promising, but public health officials warn that the risks may still outweigh the benefits.