xkcd on Glass Half Empty

Read on and you’ll know:

The lesson: If the optimist says the glass is half full, and the pessimist says the glass is half empty, the physicist ducks.

via Glass Half Empty.

Running the red light due the Doppler Effect

Q: How fast would you have to go in your car to run a red light claiming that it appeared green to you due to the Doppler Effect?

A: Around 1/6 the speed of light

A couple more interesting Physics questions in there. Wonder whether they’ve been featured in the engineering entrance exams.

via xkcd what if: Short Answer Section.