title: FREE PowerPoint Presentations. PowerPoints for Teachers
description: FREE Power Point Presentations for Teachers and Students. FREE Power Point Presentations for school. For Biology Chemistry Maths English History Physics Geography Spanish PowerPoints. Great for K - 12, KS1 KS2 KS3 KS4 and post 16 A level lesson plans, GCSE.
title: The Powder Toy - Download
description: The Powder Toy is a desktop version of the classic 'falling sand' physics sandbox game, it simulates air pressure and velocity as well as heat!