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Apr 23,  · The challenge is to come up with a design for the fastest robot. Build a Recycling-Sorting Machine: use magnetism as one approach to tackling a real-world problem of separating various materials that get combined in single-stream recycling programs. The challenge is to design a machine that can successfully separate different kinds of materials.

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Ask Science will help you make sense of the science in your everyday life. Listen Now. More From Ask Science. What Happens to Saltwater Fish in Fresh Water? By Sabrina Stierwalt, PhD-- 04th Oct Some of my best episodes, in my humble opinion, are inspired by the questions that my daughter asks me. To make it through another heatwave here.