READ A REVIEW

“The BEST book I have EVER read!” Michael David, aged 11

“A very engaging story, which creatively combines time travel with fun and simple scientific experiments…I could not put the book down.” Dr. Hans-Dieter Sues, Associate Director of Research and Collections, Smithsonian Institution.

“McGowan literally brings history to life and manages to weave in a bit of science at every opportunity.  A totally delightful read.”  Judy Scotchmoor, Director Education and Public Programs, University of California, Berkeley.

 “Time travel plus well-designed, do-it yourself experiments yields ABACUS an adventure story that is sure to inspire budding young scientists.” Professor Blaire Van Valkenburgh, President, Society of Vertebrate Paleontology.