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Candidates for political office — from sheriff to president — expect to be pounded by attack ads. Even founding fathers Thomas Jefferson and John Adams hurled insults at each other in the presidential election of 1796. Today, radio, TV and Internet attack ads, spread virally by social media, can distort the truth, demonize opponents and violate civic taboos. But they work. They're controversial because they use subtle — and often not-so-subtle — suggestions to plant slanderous information in voters' minds. Here are 10 of the most controversial political ads from the past 50 years.

Like religion and politics, UFOs stir passions. It’s been more than 60 years since the Roswell Army Air Field in New Mexico became the alleged final resting place for alien life forms. These supposed intergalactic travelers crashed in the desert, terrestrial navigation apparently not their strong suit. In the years since neither believers nor skeptics have managed to dominate the debate. An ABC poll in 2000 found that nearly half of all Americans and millions more globally believe we're not alone. Among UFO believers are these 10 famous people.

The “bully pulpit” is the power of American presidents to get things done with the spoken word. FDR, Kennedy and Reagan were masterful. Bush was inept. Eisenhower was a man of few words; Clinton a man of too many. LBJ bullied; Carter sermonized. Truman spoke honestly; Nixon did not. Presidents talk a lot, but we remember most the sound bites they leave behind, like echoes. These are the top 10 presidential quotes of the 20th century.