Equinox = "equal night" ... when days and nights are as equal in length as they can be. There's one in the spring and one in the fall.
Folklore has it that on this first day of spring, one can stand raw eggs on end. Apparently this derives from the notion that due to the sun's equidistant position between the poles of the earth at the time of the equinox, special gravitational forces apply.
But is it true?
Most scientists say no. Click here for their reasoning.
The truth is that you should be able to stand raw eggs on their end at any time of the year ... and this video will show you how :)