One of the guns, a basic rifle, looked so unprofessional that museum staff assumed it was a toy air gun or a homemade weapon ... and designed to be simple, cheap and easy to make.

[Markus Gritsch] and his son had a fun Sunday putting together a little toy airboat from a kit ... He applied a cheap knock-off arduino, equally cheap nRF24L01+ chip of dubious parentage, and ...