Pre-Order Book Online Now for Signing Day

Saturday, August 21, 2021 will be the 84th birthday of Bob de Hilster and he and his son David have chosen this day to officially launch their new book: “Principia Mathematica 2 – A Complete Toolkit for Hacking the Physical Universe”. The occasion will be marked by an in-person and virtual book signing by the father/son team in their home in Boca Raton Florida.

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