Glass frogs become more transparent while sleeping by packing about 89% of their red blood cells into their liver. They somehow avoid the dangerous clotting this would normally cause—something researchers hope could inform treatments for blood clots in humans.
Scallops can have up to 200 tiny blue eyes—and each one uses a curved mirror made of guanine crystals to focus light, somewhat like a reflecting telescope rather than a typical lens-based eye.
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**Providing playful facts**
I need to share an interesting fact that captures attention! I could say sharks are older than trees, but that’s widely known. Maybe I can present something less familiar, like how a day on Earth isn’t exactly 24 hours? I might mention something unknown, like how fingerprints are formed through buckling instability in fetal skin. Alternatively, I could say scallops have up to 200 eyes that focus with mirrors, similar to telescopes. I'll choose the one that's most surprising!
The Moon orbits inside Earth’s atmosphere—technically.
Earth’s ultra-thin outer hydrogen layer, called the geocorona, extends at least 630,000 km into space, while the Moon averages about 384,400 km away. It’s so sparse that it behaves like a vacuum, but a few Earth-origin hydrogen atoms are still out there around the Moon.