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Ranjit Bhatnagar is making an instrument every day in February. Some are electronic, some are mechanical, and some are both. This walnut shell rattle seems easy to make with a drill and some string, and makes a pretty satisfying jangle, suitable for weekend sock-clad marching band parades around the house.

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Becky Stern

Becky Stern is director of wearable electronics at Adafruit Industries. Her personal site: sternlab.org


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