Making a Heart with Maths

Inigo Quilez (iq) explains how to model a simple heart with mathematics. Shadertoy code and real-time version can be found here. I love how he embedded the model into the video. Need to explore how to develop plugins for AfterEffects. Jim Fowler, Professor at Ohio State University applied a similar technique in his Calculus course on Coursera. He used the old ray tracing tool POV-Ray with ArUco, a library for augmented reality applications.
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Zequals and the Art of Estimation

In this Numberphile video Rob Eastaway presents Zequals which can be useful if you need to compute a quick estimate, for example to find out if your calculation is on the right track. The idea is to ruthlessly round every number to just one significant digit. For example: 3 * 7 = 21 zz 20 7 * 8 = 56 zz 60 436 * 68 zz 400 * 70 = 28000 zz 30000 The actual answer is 29648 and surprisingly close to the zequal result of 30000.
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