- Rainbows can only be seen in the morning or late afternoon (the sun needs to be less than 40 above the horizon).
- 45% of people use mouthwash daily.
- 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.
- The Great Wall of China is approximately 6,430 Km long (3,995 miles).
- DVDs are physically the same size as a CDs but can store 13 times more data.
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