The main difference between the eggs we are using in lab and the ones in your kitchen at home is that the lab eggs are

What do you mean In the Waves lab you changed to see how it would affect wave speed

Well, both latitude and intensity of light affect temperature because, the higher the light intensity, the higher the temperature and since latitude is the measure of how close you are to the equator, then the closer to the equator you are, the higher the temperature is.