Among his myriad scientific and artistic contributions, Leonardo da Vinci’s work in embryology was groundbreaking. He observed and diagramed the previously undemonstrated position of the fetus in the womb with detailed accompanying annotations of his observations.
The principal work of
SEC. 509. (a) None of the funds made available in this Act may be used for--
(1) the creation of a human embryo or embryos for research purposes; or
Embryogenesis is an intricate process that can easily be disrupted by means of
On 9 August 2001, US President George W. Bush gave an eleven-minute speech from his ranch in Crawford, Texas, on the ethics and fate of US federal funding for stem cell research. The speech is available at