This die is a disdyakis dodecahedron. The edges form 9 great circles, and the die is perfectly numerically balanced: opposite faces always add up to 49, and the sum of every group of 8, 6, or 4 numbers around each vertex is the same for all groups of the same type.
Measure 30mm in diameter
This book is a comprehensive, accessible, illustrated exploration of the fascinating science of colour. Organized by 50 of the most essential questions about color across a variety of fields (physics, chemistry, biology, technology, and psychology) Arielle and Joann Eckstut examine how and why we see colour,...
A special edition of the Haynes Apollo 13 Manual, to coincide with the 50th Anniversary of the Moon mission April 1970 which very nearly ended in catastrophe. The special edition includes an expanded look at what was learned from the investigation, and how these lessons...
Alan Turing designed some of the earliest computers and was pivotal in the cracking of the Enigma code used by the German Navy. Tragically, his accomplishments were never fully recognised during his lifetime due to his homosexuality, then a crime in the UK. In 1952 he...
Celebrate women working and achieving in STEM with this brilliant pin. Part of our Badges of Honour range. Enameled blue metal badge. Measures approx 3 cm long.