Volume I. THIS AND THAT
QC indicates a Quick Challenge. TC indicates a Tough Challenge.
Vol I. #1. Carbon-14 Dating Middle School and higher
Vol I. #2 Horse Power Middle School and higher
Vol I. #3 Density TC Senior High School
Vol I. #4 Sex-linked Traits Middle Level
Vol I. #5 Rapid Growth - QC
Vol I. #6 Calculating Cost - QC
Vol I. #7 Construction Costs - TC - A building trades challenge
Vol I. #8 You Can't Lose Your Marbles Middle School through High School
Vol I. #9 Air Pressure and Density Middle School and higher
Vol I. #10 World Records - On The Moon?!? All levels - For the fun of it
Vol I. #11 Attention Geniuses Math Riddles, All levels
Vol I. #12 A Tough One TC - Math riddle for High School
Vol II. HEROES AND VILLAINS is in the works - stay tuned!