He sent the two kinds of sperm swimming down a glass tube through ever-thicker albumin barriers. The sperm with the X chromosome had a larger head and a longer tail, and so, he figured, they would get bogged down in the viscous liquid. The sperm with the Y chromosome were leaner and faster and could swim down to the bottom of the tube more efficiently. In the late s, Ericsson leased the method to clinics around the U.
How old are you? United States Highest education received: College degree eg. Definite Religious affiliation: Atheist How religious are you? Heterosexual How many sexual partners have you had in your animation including oral sex? Single How would you best classify this hookup? Can you repeat that? did they look like? How able-bodied did you know them, had you hooked up before?