- The Cambodian alphabet has 74 letters.
- 1 gigayear = 1,000,000,000,000 years.
- The US produces 19% of the world's trash.
- Sir Isaac Newton was 23 when he discovered the law of gravity.
- The 'black box' that houses an airplanes voice recorder is actually orange so it can be more easily detected amid the debris of a plane crash.
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