Former U.S. Vice President Joe Biden was at center stage Thursday on the second night of Democratic presidential debates, but one of his main challengers, Sen. Kamala Harris, sharply questioned his relations with segregationist lawmakers four decades ago and his opposition to forced school busing to integrate schools.

ON THIS DAY IN AMERICAN HISTORY On June 28, 1939, Pan American (Pan Am) launches the first transatlantic passenger service between New York and Marseilles, France. The plane used for the service was the B-314 “Yankee Clipper” seaplane the largest plane ever built until the Boeing 747 flew three decades later. The double-decker plane could hold 74 passengers and had a range of 3,500 miles. The accommodations were first class, and the seats could be converted to beds, as the flights took as long as 29 hours. The cost of a one-way trip was $375. Pan Am launched passenger service between New York and Southampton, England on July 8, 1939.

Vietnam is squelching YouTube’s business activity after the service posted thousands of videos that the government considers inaccurate, offensive to the Communist leadership or a method to recruit children to gangs, official media and tech industry sources say.

VIDEO: The US and Iran could be on a collision course in the Persian Gulf. But with tensions near the boiling point, is there still room for diplomacy? What’s next in the standoff between the two countries and whose side are our allies on? Check out the latest episode of Plugged In .

VIDEO: A small-town charity wanted to feed hungry homeless people and support the arts that feed people’s hungry souls. So, to meet these needs and others, the Community Foundation in Harrisonburg, Virginia, set an ambitious fundraising goal of more than $300,000 and cranked up an online campaign to encourage donations.

For the first time in four years, the wife of rights lawyer Wang Quanzhang was allowed to visit her husband, who is serving a 4-and-a-half-year sentence in a jail in east China’s Shandong province.