Rio de Janeiro was once capital of Portugal, making it the only European capital outside of Europe.
9
Any domino can knock over another object up to 1.5x its size. The 32nd object would be big enough to knock over the Empire State Building.
18
Diamonds can be shattered with a hammer.
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Switching letters is called spoonerism. For example, saying "jag of Flapan", instead of "flag of Japan".
2
Scientists have developed a microparticle filled with oxygen that can be injected into the blood stream, enabling us to live without breathing.
21
Parrotfish make themselves a kind of mucus 'sleeping bag' which masks their smell from predators and keeps parasites away.
4
Poor eyesight (myopia) is associated with higher IQ.
232