How did the first peoples know which foods were safe to eat? Excellent question! Food historians make educated guesses based on ancient records and modern practices.
When water freezes its entropy decreases. This does not violate the second law of thermodynamics. The second law does not say that entropy can never decrease anywhere. It just says that the total entropy of the universe can never decrease.he entropy increases whenever heat flows from a hot object to a cold object. It increases when ice melts, water is heated, water boils, water evaporates. The entropy increases when a gas flows from a container under high pressure into a region of lower pressure.
The reason has to do with the behavior of ocean water when it freezes. When salt water freezes, much of the salt is expelled from the ice or gets trapped in pockets of salty liquid water within the ice. Eventually, most of the salt makes its way into the water just under the ice.