We all carry supercomputers in our pockets and use dozens of electric gizmos every day but rarely stop to marvel at the magical act of flicking a switch. Use your ordinary conducting and extraordinary ...
The flashing is thanks to LEDs with a built-in, integrated flashing circuit and the nasty noise comes from a piezoelectric buzzer — both are available from electronics stores that sell ordinary LEDs.
Most kids love play dough. It's squishy, squashy and can keep them entertained for hours if we're really honest with ourselves. What's better is, it's really easy to make. Sara Davies MBE is known for ...
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