The chaperon was a type of hood worn throughout Western Europe in the Middle Ages. It was especially fashionable in 15th-century Burgundy. The French verb chaperonner, meaning "to cover with a hood," was derived from the name of the headgear and later came to mean "to protect." Under the influence of the verb sense, the French noun chaperon came to mean "escort," a meaning that was borrowed into English by the early 1700s. Why was Joan of Arc denounced for wearing a chaperon? Discuss

The Church of St. George, Lalibela, is a monolithic church in Lalibela, Ethiopia, hewn entirely from a single block of stone. Known as Bete Giyorgis in Amharicأ¢â‚¬â€‌a Semitic language spoken in Ethiopiaأ¢â‚¬â€‌it was built in the early 13th century as the last of the 11 stone churches in the Lalibela area. According to Ethiopian cultural history, the church was built after King Lalibela had a vision in which he was instructed to construct the church. According to the story, who told him to do so?

Apiculture is the practice of beekeepingأ¢â‚¬â€‌the care and manipulation of honeybees to enable them to produce and store more honey than they need so that the excess can be collected. Beekeeping is one of the oldest forms of animal husbandry. Early efforts at collecting honey required destroying the hive. However, modern beekeepers are able to extract the cells of the honeycomb without damaging them. To collect honey, beekeepers need a veiled helmet for protection and a smoker, which does what?

Only 42 people are dead or missing in Koizumi, compared to over 8,500 in neighboring Minamisanriku, thanks to 3 factors

Unlike neighboring Minamisanriku, Koizumi perseveres, thanks to practice drills that led town's population up a nearby hill to safety

The town of Koizumi, Japan was wiped off the map by the tsunami, but, thanks to practice drills, only 42 people are missing or dead. As Lucy Craft reports, the neighboring town of Minamisanriku was not so lucky.

The voluntary evacuation zone around the damaged Fukushima Daiichi nuclear power plant in Japan was expanded from 12 to 19 miles amidst fears of a possible breach at one of the reactors. Bill Whitaker reports.

Katie Couric spoke with James Acton, an expert on nuclear safety, on what the higher levels of radiation found in Japan and a possible reactor breach could mean for the country.

Despite the announcement that NATO would be taking command of operation Odyssey Dawn in Libya, the American military remains indispensable to its success. David Martin reports.

What started in Egypt, Tunisia and Libya is now happening in places like Yemen and Syria. In each country, protesters are demanding change from hardline governments. Katie Couric reports on the latest uprisings in the Middle East.