Martin Kaste

When you listen to the protesters, the message is clear: They think police are too quick to pull the trigger when faced with potential danger.

The reality is that it's very difficult to tell whether this is something that's changing: The statistics on police use of force in the U.S. are too unreliable to say anything for certain.

Investigators say a young African-American man named Micah Xavier Johnson was the sole attacker in Dallas Thursday night, when he shot 12 police officers, killing five. The attack came at the end of an otherwise peaceful march protesting police shootings.

Copyright 2016 NPR. To see more, visit NPR.

Copyright 2016 NPR. To see more, visit http://www.npr.org/.

Future Shock by Alvin Toffler was a huge sensation when it was published in 1970. The book perfectly captured the angst of that time and prepared society for more changes to come. Toffler died on Monday at the age of 87. This story originally aired on July 26, 2010, on All Things Considered.

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