Last night, my husband and I were preparing to watch Poker Face with our daughter. (If you haven’t seen this new show starring Natasha Lyonne, you should try it. It’s a combination of Columbo–in terms ...

We have all noticed how the horn of a speeding car changes as it approaches: each wave-peak is emitted from a closer point, so the wave is “squeezed” and the pitch increases. As the car recedes, the ...