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Frank DeAngelis helped shepherd students to safety during the shootings in 1999. The tragedy took a toll on DeAngelis but he promised the students he would stay.

Armed with technology know-how, teens and preteens are learning to hack everyday items and find bugs for major tech giants. Their work can pay off, with companies offering rewards for fixes.

Dennis talks to Ray Abeyta, a T'ai Chi sifu, about the art of T'ai Chi, how the martial art helps cancer survivors focus on healing, and what a Tai Chi…

Don't you think that sometimes, even in baseball, with all its sacred statistics, you can round numbers off and call it equal, plus or minus a margin of admiration?

Steinway Musical Instruments is on the auction block and a mystery bidder, rumored to be hedge fund manager John Paulson, appears to have the winning bid at $458 million. Ilya Marritz explains why the fairly healthy company is seeking a buyout in the first place.

Growing numbers of Brazilians are visiting the U.S.; last year, they spent $9 billion. It's a sign of a changing Brazil — more affluent, more outward looking. Most of those getting visas to the U.S. are going to shop or do business, and the economic impact has been palpable.

Sagging power lines and computer glitches led to a power outage that left 50 million people across the Northeast U.S. and part of Canada in darkness on Aug. 14, 2003. New sensors have been installed, and operator training and computer systems have been upgraded. But is that enough to prevent another massive blackout?

Eighteen sailors are feared trapped in a submarine that caught fire after a massive explosion in Mumbai. The smoldering ship is in its berth at a highly secured naval base, with only a portion visible above the surface. This incident comes as a setback for India, just as the country is trying to beef up its military.

After days of tense standoff in Cairo, Egyptian security forces began clearing two sit-in camps by supporters of ousted President Mohammed Morsi. The Interior Ministry, which is in charge of police, warned in a statement that the forces would deal firmly with protesters acting "irresponsibly."

Scores were killed when security forces cleared sites where supporters of ousted President Mohammed Morsi had been camped. Vice President Mohamed ElBaradei, a Nobel Peace Prize laureate, has resigned in protest over what he says was unnecessary bloodshed.