The five most popular stories on CNN.com in the past 24 hours, according to NewsPulse.
U.S. apologizes for infecting Guatemalans: The United States apologized Friday for a 1946-1948 research study in which people in Guatemala were intentionally infected with sexually transmitted diseases.
Dad shoots 3 sons, killing 2, police say: A New Jersey father fatally shot his two teenage sons, critically wounded one more and set his home ablaze before police killed him, authorities said Friday.
East Coast to see more torrential rain: A large storm system flooding portions of New York, Pennsylvania and New England on Friday afternoon has claimed at least eight lives.
Purported bin Laden message focuses on relief, development: A message purportedly from al Qaeda leader Osama bin Laden is urging Muslims to tackle famine, flood relief, the effects of climate change and clean water - stark problems plaguing parts of the Islamic world.
Rutgers suicide incident raises legal issues: Amid intense public attention, Tyler Clementi's family remained quiet Friday, except to say that their personal tragedy has raised a host of legal issues for the country.