One of the projects used compressed air (but was not actually connected to any air).
The other one was coil gun: a tube surrounded by a coil and powered by a standard AA battery.
An unidentified school employee saw the air-pressure projectile device and got scared because, to her, it looked like a fearsome weapon.
The amount of knowledge the employee has concerning science – if any – is unclear.
As a result of the unnamed employee’s fears, Schiller – who actually never got to see either the air-pressure project or the coil project except in photos – was dismissed from the classroom indefinitely."
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