Mohammad Al Abdallah, the executive director of the Syria Justice and Accountability Centre, shows a video that was posted to YouTube of illegal cluster bombing in Syria. Meredith Rizzo/NPR hide caption
Artist and flipbooked.com founder Liza Tudor thumbs through "1st Steps," a flipbook of Nicole Garrens' son Zander's first steps. Tudor sent the flipbook to Garrens' husband, Roy, who's currently incarcerated in Texas. Noel Black for NPR hide caption
A board at Heathrow Airport in London displays a slew of cancellations for British Airways flights on Saturday. An IT systems failure laid waste to flyers' plans at the U.K.'s two major airports over the weekend, and the situation is yet to be completely resolved as of Monday. Daniel Leal-Olivas/AFP/Getty Images hide caption
The good old reflex hammer (like this Taylor model) might seem like an outdated medical device, but its role in diagnosing disease is still as important as ever. Meredith Rizzo/NPR hide caption
Will Shindel prepares for a gene-editing class using the CRISPR tool at a Brooklyn community lab called Genspace. Alan Yu/WHYY hide caption
After A Terrorist Attack, Social Media Can Cause More Harm Than Good
Mark Zuckerberg told graduates to pursue "big meaningful projects." Paul Marotta/Getty Images hide caption
Ke Jie, the world's No. 1 Go player, stares at the board during his second match against AlphaGo in Wuzhen, China, on Thursday. The 19-year-old grandmaster dropped the match in the best-of-three series against Google's artificial intelligence program. AFP/Getty Images hide caption
A Newark police officer wears a body camera last month. The cameras, which will be worn by officers as part of a federal monitoring agreement, are provided by Panasonic. Julio Cortez/AP hide caption
Researchers had participants wear the fitness trackers while walking or running on a treadmill and while riding an exercise bike to determine how well the trackers measured heart rate and energy expenditure. Paul Sakuma/Courtesy of Stanford University School of Medicine hide caption
Shots - Health News
Fitness Trackers: Good at Measuring Heart Rate, Not So Good At Measuring Calories
Fitness Trackers: Good at Measuring Heart Rate, Not So Good At Measuring Calories
Floral tributes and messages in St. Anns Square on May 24, 2017 in Manchester, England. Jeff J Mitchell/Getty Images hide caption
Spectators watch the world's top-ranked Go player, Ke Jie, square off against Google's artificial intelligence program, AlphaGo, during the Future of Go Summit in Wuzhen, China, on Tuesday. The program beat Ke in the first of three planned matches. Peng Peng/AP hide caption
David Giovannoni uses a reproduction of Scott's phonautograph. Giovannoni is part of the team that recovered the audio from Scott's recordings. Art Silverman/NPR hide caption
While the government dodged a bullet this time by avoiding the latest malware attack, experts say its systems are still vulnerable. Intrepid00/Flickr hide caption