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Inside a $1 radar motion sensor
I recently got some cheap microwave motion sensors, mostly because I was wondering how China managed to make a radar for under a dollar:
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2
Making a rickroll laser: A parametric speaker
Most speakers emit sound in all directions because they are relatively small compared to the wavelength. Audible sounds have wavelengths of up to several meters, so an acoustically "large" speaker might not even fit in your house.
3
The physics of airplane flight
A common misconception about wings is that they need to have the classic airfoil shape to work. In reality, just about any surface can create lift and function as a wing.