James' World 2

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The spectrum covers everything from radio waves and microwaves to the light that reaches our eyes, to X-rays and gamma rays. And humans have mastered the art of sending and receiving almost all of them. There is an exception, however. Between the beams of visible light and the blips of radio static, there lies a dead zone where our technology isn’t effective. It’s called the terahertz gap. For decades now, no one’s succeeded in building a consumer device that can transmit terahertz waves.

“There’s a laundry list of potential applications,” says Qing Hu, an electrical engineer at MIT.

But some researchers are slowly making progress. If they stick the landing, they might open up a whole new suite of technologies, like the successor to Wi-Fi or a smarter detection system for skin cancer.

Look at the terahertz gap as a borderland. On the left side, there are microwaves and longer radio waves. On the right side lies the infrared spectrum. (Some scientists even call the terahertz gap “far infrared.”) Our eyes can’t see infrared, but as far as our technologies are concerned, it’s just like light.

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Engineers from Harvard, MIT, and the US Army created this experimental terahertz laser setup in 2019. They are among the few to do so. Arman Amirzhan, Harvard SEAS

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Beneath the fluffy backsides of Valerie Robson’s two male golden retrievers is an unusual sight: intact anatomy. Neither dog is neutered.

This presents occasional challenges. Astro and Rumble are barred from most doggy daycares, and many boarding kennels won’t take them. But although Robson has no intention of breeding the dogs, she says she has no regrets. Research that suggests neutering could be linked to cancers and joint disorders persuaded her that skipping sterilization was best for her pets.

“Sometimes people notice,” said Robson, a county government employee in Conifer, Colo. “I just explain that we chose to do this for health and wellness, and he’s a good boy, and it’s never been an issue.”

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Photo by Christina Reichl Photography/Getty Images

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Across the globe, millions of people believe the Earth — that whirling blue sphere, spinning through space — is, in fact, a flat plane. Believers diverge on the specifics but tend to understand that we all live beneath a dome that floats through space, or perhaps, hovers above primordial waters.

It’s unclear how many people believe some version of Flat Earth theory. Tens of thousands of people belong to social media accounts dedicated to these theories, and popular videos explaining the theory have hundreds of thousands of views. Some high-profile figures, including NBA star Kyrie Irving and rapper B.o.B., have flirted with or even openly endorsed the theory. Flat Earth believers held conferences before the covid-19 pandemic and showed up at anti-mask and anti-vaccine protests throughout it.

And polling gives us some sense of the scale of this belief system: As many as 1 percent of Americans (that’s more than 3 million people) and 7 percent of Brazilians (11 million people) say they believe the Earth is flat, for example.

The modern Flat Earth movement has its origins in a snake oil salesman and utopian named Samuel Rowbotham, said Kelly Weill, a journalist who covers fringe movements for the Daily Beast and spent years researching this movement and its adherents. In her book, “Off the Edge: Flat Earthers, Conspiracy Culture, and Why People Will Believe Anything,” she traces the conspiracy theory’s resurgence in about 2015, when it began spreading across social media.

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Illustration: Mae Decena

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