Animal Index is a cute set of book dividers (also works for magazine and CDs) by Hiroshi Sasagawa, made to look like animal silhouettes.
They look like something you can make yourself as a fun weekend project with the kids!
Link [in Japanese] - via Happy Mundane
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1. The Moon is freakin' huge, we're talking ginormous. A natural satellite of the earth should be something closer to 30 miles in diameter, Luna is over 2000 (that's bigger than Pluto).
2. The moon doesn't have a magnetic field, but it's rocks are magnetized.
3. Some moon rocks date back 4.5 billion years and there's even one that was dated 5.3 billion years old (that's a billion years older than the Earth.
4. Moon rocks have also been found to contain processed metals like brass and mica, and uranium236 and neptunium237 (those have never been found to occur naturally).
5. The Moon also appears to be freakin' hollow!