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On 13th of December 2010
For most of the 20th century, people did not expect or welcome the intrusion of doctors' advice into their lifestyle habits, tobacco was culturally acceptable in the western world. In the United States, annual cigarette consumption rose from an average 49 per person in 1900 to 4318 in 1965.
The first important medical paper proposing a link between smoking and lung cancer was written by a German doctor, FH Müller, and published in Germany in 1939. Adolf Hitler supported anti-smoking campaigns and tobacco was banned in the Luftwaffe.
8-celled human embryosLight microscope image of two8-celled human embryos ready to be implanted into their mother's womb. Pre-implantation embryos withstand freezing for long periods of time allowing them to be implanted at intervals coinciding with normal birth spacing.