Just read a story about Sperm Donors on ColbyCosh.com where several prolific donors are described. Upon reading about these guys, I immediately wondered if it would be a problem if any of the many (thousands in one instance) of half-siblings ever got married and had offspring of their own. A topic for further research: what genetic consequences arise when half-siblings have children. If it isn't a good thing, I wonder if the sperm banks have thought about the possibility.

If a bunch of birth defects show up in Texas, I know where to look for finding the cause ...