Electromagnetic energy travels almost like an ocean wave - up and down,up and down.

VOA: special.2010.12.08

A mighty wave rose up and over the side of the boat.

VOA: special.2009.02.28

"It is going to be a big anti-incumbent year, and a big anti-Washington year, and what is still left a little bit up in the air after last night is how much that anti-incumbent wave, how disproportionately that anti-incumbent wave, will wash over the Democrats."

VOA: standard.2010.05.19