Welcome to


The official Web site of

David A. Katz

Originator of Chemistry in the Toy Store

Chemist, Educator, Expert Demonstrator,
Science Communicator, and Consultant



Programs and workshops for teachers,
schools, museums and the public.

  • Contact Information
  • About this website
  • Includes some background information
  • NOTE: New address effective November 1, 2017
  • IYPT Essays and papers for The International Year of the Periodic Table
  • Polymers The chemistry of polymers with hands-on activities and experiments
  • Home