Ancient Egyptian pregnancy test survived millenia because it worked (2018)
Kind of a tangent (but potentially useful and little known) is the "baker's method" of male contraception.<p><a href="https://en.wikipedia.org/wiki/Marthe_Voegeli" rel="nofollow">https://en.wikipedia.org/wiki/Marthe_Voegeli</a><p><a href="https://en.wikipedia.org/wiki/Heat-based_contraception" rel="nofollow">https://en.wikipedia.org/wiki/Heat-based_contraception</a><p>> It has long been observed that men who work in professions that expose them to heat in the nether regions: bakers, cooks, steamworkers; have had a hard time fathering children. Interestingly, men in these professions were observed to start having children after retiring or finding a new job. Based on these observations, Dr. Martha Vogeli [<i>sic</i>, her name ends with 'e': Marthe] ran a long set of experiments starting in the 1940’s in India. After trying all possible combinations, Dr. Vogeli found a consistent method for inducing temporary infertility in men by a series of hot baths. In short, men who sat in hot water for 45 minutes a day for 3 weeks were protected for at least 6 months.<p>~ <a href="https://www.dontcookyourballs.com/heat-based-contraception-natural-birth-control-for-men/" rel="nofollow">https://www.dontcookyourballs.com/heat-based-contraception-n...</a>