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Editor's note: This is an excerpt from the latest episode of the Invisibilia podcast and program, which is broadcast on participating public radio stations.

Walking among the California redwoods, drifting blank-brained on a break from college, I got to thinking about shoes. I can't say why, exactly. Perhaps it was because they were touching my feet.

It's really hot in most of the mainland United States right now. The National Weather Service predicts temperatures in the triple digits through the weekend in much of the South, Midwest and along the East Coast.

The culprit: a "heat dome."

It's a real meteorological event — the National Oceanic and Atmospheric Administration even took the time to define it in the agency's warning this week:

Facebook just announced the first full-scale test flight of its unmanned, high-altitude airplane, Aquila. The plane isn't finished yet — the 90-minute test flight assessed only its takeoff and low-altitude flying capabilities — but its ultimate goal is to provide wireless Internet to the ground as it flies.

Facebook founder Mark Zuckerberg shared a video of the test flight.

During our time covering the Republican National Convention in Cleveland this week, we asked pretty much everyone we met why they were supporting Donald Trump.

Here are some of their answers:

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The Justice Department calls it the largest criminal health care fraud case ever brought against individual suspects: Three people are accused of orchestrating a massive fraud involving a number of Miami-based health care providers.

The three facing charges are all from Florida's Miami-Dade County; they include Philip Esformes, 47, owner of more than 30 Miami-area nursing and assisted living facilities; hospital administrator Odette Barcha, 49; and physician assistant Arnaldo Carmouze, 56, the Justice Department says.

Days after Charles Kinsey was shot by North Miami police as the behavioral health care worker tried to help a patient, we now know more about the officer who fired the shot — and according to the head of the local police union, the officer was trying to shoot Kinsey's patient, a man with autism, not Kinsey.

"Fearing for Mr. Kinsey's life, the officer discharged his firearm, trying to save Mr. Kinsey's life," says John Rivera, president of the Dade County Police Benevolent Association. "And he missed, and accidentally struck Mr. Kinsey."

Who hasn't dreamed of visiting France? The two most popular tourist destinations in the country are Paris and Nice, on the French Riviera. But now they've both been hit by deadly attacks — three large-scale attacks in a year and a half.

Last Thursday's truck rampage in Nice killed 84 people on a seaside promenade watching fireworks. It's taken a serious toll on the French spirit – and has made some tourists reconsider a visit.

Etharin Cousin heads the United Nation's World Food Programme — but lately she sounds more like the captain of a ship facing some very ugly weather.

"We are seeing all the indicators of a perfect storm coming toward us in Southern Africa," Cousin said in a recent press call this week. "And we are saying that we have the opportunity to move this boat in a different direction and to avoid the storm."

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