What means "wave" in this context? Ah .. got it ... If you wave on him then don't forget to open your fist. http://youtu.be/u92EwvmHSLw
What means "wave" in this context? Ah .. got it ... If you wave on him then don't forget to open your fist. http://youtu.be/u92EwvmHSLw
Your wrong on both accounts. 1) air - you can see it in the same way you see any object. Light is reflected and refracted through air. When you see a blue sky, your seeing the gas that makes up our atmosphere. You can explain it in the same way you explain any matter. 2) gravity - if you pick something up, hold it up, and then let go, you will witness gravity.