1. They are able to have offspring even though their sperm is bad, even though some of them are infertile.

2. They are of course the baby boomers, the collective offspring of the most fertile period in American history.

3. Obama approved the program as a goodwill gesture to offspring of those in the country illegally who would otherwise lack a homeland.

4. As individuals reproduce, their offspring may have genetic mutations that neither of their parents had.

5. The modified males then mate with wild females whose offspring die, reducing the population.