There have been many occasions in history where it has been necessary to choose between two alternatives and those doing the choosing don’t always get things right. One example of this was the decision on which was positive and which was negative when determining the charges when rubbing two objects together to generate static electricity. [...]

What was it about the early years of the 20th Century that caused people to start associating particular colours with particular genders? Just why did they decide that it should be pink for boys and blue for girls when no such association with colour had ever existed before. The reasons for the reversal of the [...]