Words in the news.

1968 Democratic National Convention (page 5) The 1968 Democratic National Convention was held at the International Amphitheatre in Chicago. It was a time of turmoil; protests were so unruly that Mayor Richard J. Daley dispatched nearly 12,000 police officers to maintain order. At the convention, Democrats had to choose a candidate for president. President Lyndon B. Johnson had announced that he wouldn't seek reelection, and front-runner Robert F. Kennedy had been assassinated in June. The nomination went to Vice President Hubert Humphrey, who later lost to Republican Richard Nixon. Learn more at tinyurl.com/68onzy.

Mission Control (page 6) NASA's Mission Control Center is the hub of operations for piloted aerospace flight missions, from liftoff to landing. The primary mission control. center is at Johnson Space Center in Houston. A backup center is at Kennedy Space Center in Florida. About 75 percent of mission control's time is spent planning missions. Only about 10 percent is spent managing missions. The balance is used for training. Learn more at tinyurl.com/58uumh.