• Do you know Printers spy on you? Printer manufacturers print invisible yellow dots on consumer's prints that check to see if a person is printing counterfeit money. If you call your printer manufacturer and ask them to "please stop spying on you", they will send secret services to your address to find out why you care about your privacy. Upset?• It is possible to see a rainbow as a complete circle from an aeroplane.
• A liter of vinegar is heavier in winter than in summer.
• Copper turns green when exposed to air for a pretty long time.
• Nitrous oxide can make you laugh. That is why it is called laughing gas.
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