A DNA test revealed Matt Katz was conceived by a sperm donor. His mother had no idea.

Matt Katz, host of the new podcast "Inconceivable Truth," photographed at his home office in Philadelphia. His hand-drawn family trees sit on the desk next to him.Matt Katz wanted to know where his Jewish ancestors once lived in Eastern Europe, so in 2016 he spit into a plastic vial and mailed in his DNA test. He expected to be 100% Ashkenazi Jewish.

We live in what is perhaps a singular era for these genetic revelations: older generations never imagined the kind of DNA technology that has developed, and younger generations will always operate with it in mind. The trend now is greater transparency and more access to information, spurred in part by donor-conceived activists.Katz’s quest was unusually complicated, because his DNA revealed no grandparents, cousins, aunts, or uncles.

Even decades later, secrecy remained the gold standard. Katz found a memo written by Alan Guttmacher, a well-known gynecologist and president of Planned Parenthood, from the 1940s laying out the ethical rules for donor insemination.

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