First, everyone who said that the braking effect comes from the compression stroke is wrong... the air in the cylinder is compressed which takes energy, yet after top dead center acts as a spring and helps force the piston back down, returning the exact same force as was put into it in the first place. (mechanics.stackexchange.com)
The very same force allows water striders to glide along the surface of a pond, and, as Bandi demonstrates, causes flakes to move across water. (sciencedaily.com)
I'm an atheist, and yet all of the «Christ» yapping does not bother me... just DO N'T force your views on me, and I won't do the same (religion.blogs.cnn.com)