Coursera founders Andrew Ng and Daphne Koller are computer science professors at Stanford University. Jeff Chiu/AP hide caption
National
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
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
President Barack Obama and Republican presidential candidate Mitt Romney both campaigned in the battleground state of Ohio this week. AP hide caption
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
New York Times publisher Arthur Ochs Sulzberger in his office in 1973. Anthony Camerano/AP hide caption
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