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If you feel like Internet ads are more pervasive and invasive than ever before, you're not alone. Author Tim Wu tells Fresh Air's Terry Gross that the Web has gotten worse over the years, not better — and unrelenting ads are to blame.

"I think you spend 50 percent of your mental energy trying to defeat ad systems," Wu says. "It's amazing that we've got this great scientific invention, the Web and the Internet, and then it has come to the point where using it reminds me of swatting mosquitoes."

Fresh Air Weekend highlights some of the best interviews and reviews from past weeks, and new program elements specially paced for weekends. Our weekend show emphasizes interviews with writers, filmmakers, actors and musicians, and often includes excerpts from live in-studio concerts. This week:

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Tower is an animated documentary that tells the story of a massacre that happened 50 years ago and was a historic first: A man with no record of violence shot at people at random for no logical reason.

It was Aug. 1, 1966, in the middle of a 100-degree day at the University of Texas at Austin. The shots came from the clock tower at the center of the campus. A woman eight months pregnant was the first to fall, soon to be followed by her boyfriend and a boy delivering newspapers on his bicycle. It's not the usual subject for a cartoon.

Copyright 2016 Fresh Air. To see more, visit Fresh Air.

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Copyright 2016 Fresh Air. To see more, visit Fresh Air.

TERRY GROSS, HOST:

Copyright 2016 Fresh Air. To see more, visit Fresh Air.

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America has a long and storied history with marijuana. Once grown by American colonists to make hemp rope, by 1970, it was classified as a Schedule 1 narcotic. Possession of it was — and is — a federal crime, despite the fact that in recent years 25 states have legalized medical marijuana and four states and the District of Columbia have legalized cannabis for recreational use.

Copyright 2016 Fresh Air. To see more, visit Fresh Air.

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