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MICHEL MARTIN, HOST:

Copyright 2016 NPR. To see more, visit http://www.npr.org/.

MICHEL MARTIN, HOST:

Copyright 2016 NPR. To see more, visit http://www.npr.org/.

MICHEL MARTIN, HOST:

As officials in Charlotte, N.C., consider when, if, and how to release video of the police shooting of Keith Lamont Scott earlier this week, lawyers for the family have released what they say is eyewitness video taken by Scott's wife.

When Harry Selker was working as a cardiologist in the 1970s, clot-busting drugs were showing great promise against heart attacks. But their life-saving properties were very time sensitive. "If you give it within the first hour it has a 47 percent reduction of mortality; if you wait another hour, it has a 28 percent reduction; another hour, 23 percent. And people were taking about 90 minutes to make that decision," he recalls. "So they were losing the opportunity to save patients' lives."

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