| in Did You Know Facts
Glass cracks move at a speed of 3000 mph when it breaks
That is five times as fast as the typical airplane, which flies at 575mph.
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Did you Know? Greek Fire, a weapon of the Eastern Roman Empire, was utilised in ship-mounted flamethrowers.
Hyraceum, a perfume ingredient derived from the faeces of a small rodent, is still used by niche perfume houses