The names Columbine and Virginia Tech have both become tragic shorthand for school shootings in America. In the wake of those shootings, schools have developed a fairly typical lockdown procedure when there's a threat: sound the alarm, call police, lock doors and stay put.
The standard school-lockdown plan is intended to minimize chaos so police arriving on the scene don't shoot the wrong people. Students practice following directions, getting into classrooms and essentially, waiting.
Here's an astonishing fact: Half of America's mushrooms are grown in one tiny corner of southeastern Pennsylvania, near the town of Kennett Square.
But why? It's not as though this place has some special advantage of climate or soil, the kind of thing that led to strawberry fields in Watsonville, Calif., or peach orchards in Georgia. Mushrooms can grow indoors. They could come from anywhere.
The words of the English poet William Blake still resonate 185 years after his death. Blake, who was also a painter and printmaker, wrote the famous lines, "Tyger! Tyger! burning bright / In the forests of the night."
Affirmative action in higher education appeared to take a potentially lethal hit on Wednesday, as the U.S. Supreme Court heard arguments testing the constitutionality of a race-conscious admission program at the University of Texas, Austin.
Two Americans have won the 2012 Nobel Prize in Chemistry. Robert Lefkowitz and Brian Koblika were awarded the prize for their work on protein receptors that tell cells what's going on around the human body. Their research has allowed drug makers to develop medication with fewer side effects. The pair with share the $1.2 million award.
Fifty years ago, Pope John XXIII launched a revolution in the Catholic Church. The Second Vatican Council opened on Oct. 11, 1962, with the goal of bringing the church into the modern world. Catholics could now hear the Mass in their local language. Laypeople could take leadership roles in the church. And the church opened conversations with other faiths.
For American nuns, Vatican II brought freedoms and controversies that are playing out today.
It's been a tumultuous time for American orchestras. Labor disputes have shut down the Minnesota Orchestra and Indianapolis Symphony, and strikes and lockouts have affected orchestras in Chicago, Atlanta and Louisville in the past year.
Though it's been around for three decades, 3-D printing has finally started to take off for manufacturing and even for regular consumers. It's being used for making airplane parts on demand and letting kids make their own toys. One designer is pushing the limits of 3-D printing by using it to make an acoustic guitar.
Two very different views from two different witnesses today as the House House Oversight and Government Reform Committee opened its probe into the Sept. 11 attack on the U.S. consulate in Benghazi, Libya, in which ambassador Chris Stevens and three other Americans were killed.
You wouldn't be surprised to learn that a laboratory run by the U.S. Department of Commerce is working on more precise methods to measure stuff.
However, you might not expect it to be at the cutting edge of the mind-bending world of quantum physics. But on Tuesday, David Wineland became the fourth employee at the National Institute for Standards and Technology, a federal lab, to win a Nobel since 1997. Wineland learned he will share the Nobel Prize in physics with Frenchman Serge Haroche for work that's both esoteric and practical.