Why do we need so many sperm?

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Happy 2019!  Looking back at my blogs, it seems the most popular ones are the simplest.  The ones where I attempt to explain the every day questions of infertility.  Sure, chatting about fancy lab treatments like PGT-A is exciting, but most people are hoping they will never need a "fancy lab treatment" to get pregnant.  They have good questions about the basics of getting pregnant, or not.