Irish Arms, Shark Free Waters and Lunar Orbits
In 17th century Ireland, whether you could own a gun, pistol, or sword depended upon your religion. Catholics were required to be unarmed.
If you are afraid of sharks, you can swim in the ocean safely in the hours before a hurricane arrives. Sharks can detect an approaching hurricane and will depart for the open sea before it arrives.
A billion years ago, the Moon was much closer to Earth than it will be tonight. Its tighter orbit meant it took just 20 days to make a lunar month.
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