RENEE MONTAGNE, HOST: Good morning. I'm Renee Montagne. From mysteriously green swimming pools to stickups at gunpoint, the Rio Olympics have been a bit chaotic. But the 2020 Games in

Tokyo are shaping up to be a different story. The capital is super hot and humid in the summer, so Japan's government is busy installing heat detectors and a heat-stroke warning system

for athletes and spectators. Plus, they're considering installing misters - nice, though, hard to compete with Rio's tropical beaches. It's MORNING EDITION. Transcript

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