Another fun activity from the Exploratorium Teacher Institute Project.
By suspending pieces of tape from a straw, you can build an electroscope—a device that detects electrical charge. A commonly available brand of plastic tape can gain or lose negatively charged electrons when you stick it to a surface and then rip it off. A plastic comb will enable you to identify whether the pieces of tape are positively or negatively charged.
Each Tuesday is EducationTuesday here at Adafruit! Be sure to check out our posts about educators and all things STEM. Adafruit supports our educators and loves to spread the good word about educational STEM innovations!