U.S. News and National Top Stories NPR coverage of national news, U.S. politics, elections, business, arts, culture, health and science, and technology. Subscribe to the NPR Nation RSS feed.

Coursera founders Andrew Ng and Daphne Koller are computer science professors at Stanford University. Jeff Chiu/AP hide caption

toggle caption
Jeff Chiu/AP

Vice President Richard Nixon listens as Sen. John F. Kennedy talks during their televised presidential race debate. This photo was made from a television screen in New York, Oct. 21, 1960. AP hide caption

toggle caption
AP

President Obama speaks during a campaign event at University of Colorado Boulder Sept. 2. He and his Republican challenger, Mitt Romney, will have their first debate at the University of Denver on Wednesday. Pablo Martinez Monsivais/AP hide caption

toggle caption
Pablo Martinez Monsivais/AP

Archbishop John J. Myers stands outside Cathedral Basilica of the Sacred Heart in Newark, N.J. The archbishop has urged followers to assess the presidential candidates for their views on abortion and gay marriage. Mel Evans/AP hide caption

toggle caption
Mel Evans/AP

New York Times publisher Arthur Ochs Sulzberger in his office in 1973. Anthony Camerano/AP hide caption

toggle caption
Anthony Camerano/AP

Thirty years ago this weekend, seven people died from ingesting Tylenol that had been poisoned. Since then, Johnson & Johnson has overhauled its packaging. iStockphoto.com hide caption

toggle caption
iStockphoto.com