Police in Prince George's County, Md., "have arrested a man who [they say] referred to himself as 'a joker' and threatened to shoot people at his former workplace," The Washington Post's The Crime Scene blog writes.
Dr. Lisa Sterman holds Truvada pills at her office in San Francisco. The drug was recently approved by the Food and Drug Administration to prevent infection in people at high risk of infection with HIV. The pill, already used to treat people with HIV, also helps reduce the odds they will spread the virus.
The Harvard researcher probably speaks for many of the 23,000 scientists, activists and policy mavens who came to the Washington conference. But they're going home with a big question on their minds: Can the world afford it?
The universe is being pushed apart at a faster and faster rate. And the culprit? Dark energy. Astrophysicist Adam Riess shared the 2011 Nobel Prize in Physics for that discovery, and now's your chance to ask him about it--or anything else you've been wondering about the cosmos.
And I'm Flora Lichtman. In 2007, thousands of people in Mexico took to the streets, protesting the price of tortillas. In three months, the price of corn had gone up 400 percent. Why? According to my first guest, it all started with a spike in oil prices triggered by Hurricane Katrina. That led to increased demand for ethanol, and U.S. farmers who grow a lot of the corn that Mexicans eat planted less corn for eating and more corn to make ethanol.
Bioengineers are developing microchips, about the size of a thumb, that can behave like human organs. Donald Ingber, director of the Wyss Institute for Biologically Inspired Engineering, discusses how the "organ-on-a-chip" works and why the technology could replace the animal model for drug testing.
A flurry of extreme weather events, including wildfires, heat waves and droughts may have convinced more Americans that the planet is warming. A poll by the Brookings Institute found that 62 percent of Americans now believe in global warming, and nearly half of them have cited warmer temperatures or change in weather patterns as the reason for their belief.
The London 2012 Summer Games are set to begin in earnest, with today's opening ceremony kicking off a weekend of gold-medal competitions. But if you're in America and you hope to watch the Opening Ceremony live, I'm afraid you'll be disappointed: NBC is tape-delaying its broadcast until Friday night.