....being told you were not allowed to go swimming straight after you had eaten a meal. This was, we were assured by various serious looking adults, very dangerous. If we didn't wait for our food to go down, we might sink to the bottom of the pool. But modern experts don't agree. They say that, unless you suffer from a particular medical condition, there is absolutely no need for such caution.
I mention this only to illustrate the way in which commonly held beliefs are not always true. Always check out any assumptions made.
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