However, a hymen may also be broken during physical activity. In , Huxley, as new president of the British Association for the Advancement of Science , delivered an address entitled Biogenesis and Abiogenesis. On average, a baby weighing less than 5lb 7oz is twice as likely to die from a heart attack than one born at 9lb 7oz. As Frau means "woman", it suggests a female referent. In the latter usage, virgin means uninitiated. According to Aristotle, it was a readily observable truth that aphids arise from the dew that falls on plants, flies from putrid matter, mice from dirty hay, crocodiles from rotting logs at the bottom of bodies of water, and so on. Bernal called this idea biopoiesis or biopoesis, the process of living matter evolving from self-replicating but non-living molecules,   and proposed that biopoiesis passes through a number of intermediate stages. The seeds of diabetes may also be sown before birth, as the pancreatic cells which make insulin develop in the womb. Public health authorities have been grappling with an epidemic of overdoses from prescription narcotics, heroin and fentanyl in recent years. You have encouraged them to eat their greens, battled to get them into the best school and sweated with them over their homework — all to give them the best start in life. Conditions in the uterus can also affect weight for years to come, studies suggest. The theory was developed after decades of research by Professor David Barker and his colleagues at Southampton University. A word of explanation seems necessary with regard to the introduction of the new term Archebiosis. This has traditionally been tested by the presence of an intact hymen ,  which was verified by either a physical examination usually by a physician, who provided a "certificate of virginity" or by a "proof of blood," which refers to vaginal bleeding that results from the tearing of the hymen after the first sanctioned sexual contact. By the middle of the 19th century, the theory of biogenesis had accumulated so much evidential support, due to the work of Pasteur and others, that the alternative theory of spontaneous generation had been effectively disproven. It is, however, dated too and rarely used.