Get flash to fully experience Pearltrees
What is this? A simulated annealing like optimization algorithm, a reimplementation of Roger Alsing's excellent idea . The goal is to get an image represented as a collection of overlapping polygons of various colors and transparencies . We start from random 50 polygons that are invisible.
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Now available in green for the first time ever! Become an ultraviolet detective with these amazing UV-sensitive beads! It's solar magic in action! Make bracelets, test the effectiveness of sunscreen, or experiment with color while you learn about the power of sunlight. Included is a science activity guide with lots of fun experiments with solar radiation and light.