In the early 1990s, a team of researchers decided to follow about 40 volunteer families — some poor, some middle class, some rich — during the first three years of their new children's lives. Every month, the researchers recorded an hour of sound from the families' homes. Later in the lab, the team listened back and painstakingly tallied up the total number of words spoken in each household.
The Great Wall of China, built more than 2,000 years ago, stands as one of the monumental feats of ancient engineering. Stretching thousands of miles, it protected the newly unified country from foreign invaders.
But before the Great Wall, warring Chinese dynasties built many other walls for protection. An American archaeologist recently began surveying one of the biggest.
Originally published on Sun December 29, 2013 2:56 pm
The New York Times, after a months-long investigation, says the attack on the U.S. diplomatic post in Benghazi, Libya, "turned up no evidence that Al Qaeda or other international terrorist groups had any role in the assault."
An Egyptian student is dead Saturday after clashes between police and Muslim Brotherhood supporters at the country's main Islamic university.
Egyptian media reported that the violence erupted when security forces fired tear gas to disperse pro-Brotherhood students who were trying to prevent classmates from getting into buildings at the famed Al-Azhar university. Some of the buildings were set on fire. Police said 101 people were arrested.