50, 100 & 150 YEARS AGO.

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  • Source:
    Scientific American. Dec2020, Vol. 323 Issue 6, p83-83. 3/4p. 3 Black and White Photographs, 1 Cartoon or Caricature.
  • Additional Information
    • Subject Terms:
    • Abstract:
      The article presents the discussions on various topics in Scientific American. Topics include causing infertility and averting the development of embryos; eggs fertilizing in the laboratory and cultivating to the blastocyst stage being transferred back to the mother with an excellent chance of completing development normally; and depressing value of the German mark being a modification of the barter system.