Large piles of pistachios can spontaneously catch fire.
Pistachios are very high in fat, and when they're stored or shipped in bulk, especially if they're slightly damp, the oils can slowly oxidize and generate heat. In a big enough pile, that heat can't escape, so the temperature keeps climbing until the nuts ignite on their own, with no spark needed.
It's a real enough risk that shipping guidelines treat bulk pistachios as a potential fire hazard, and cargo handlers are advised to keep them dry and well-ventilated.
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At any given moment, there's at least one spot on Earth where the wind isn't blowing horizontally at all.
This comes from a real mathematical result called the Hairy Ball Theorem. It says that if you have a sphere covered in hair, you can't comb it all flat without creating at least one cowlick, a point where the hair sticks straight up or swirls around a center.
Wind moving across Earth's surface works like that hair. Since the planet is roughly a sphere, the theorem guarantees that somewhere the horizontal wind speed is exactly zero, often at the calm center of a cyclone or some swirling pocket of air.
The same math explains why a tennis ball's seam has to curve the way it does, and why certain devices that rely on magnetic fields shaped around a sphere can't be built in some configurations.
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On Saturn's moon Titan, you could fly by flapping wings strapped to your arms.
Titan's gravity is only about 14% of Earth's, and its atmosphere is about 1.5 times denser than ours at the surface. That combination means a human with modest artificial wings could generate enough lift to fly under their own muscle power, something that's essentially impossible on Earth. You'd need a heated suit, though, since it's about -180°C (-290°F), and you'd be flying over lakes of liquid methane.
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