How to distinguish boiled eggs from those raw?

I was off lately asked this question by a scientist friend Andrey Kuzmin from Kiev.
I discovered 10 different ways to do this job:

1) Break the two eggs - apparent
2) Spin - boiled spins faster
3) Shake close to ear, the liquid is felt moving in raw egg.
4) strike softly with a spoon the raw one sounds different from boiled
5) press one side if a lying egg, the boiled one will pendulate better
6) put raw & boiled egg in one container with water & start stirring salt into it, boiled will float first
7) if both are rotated at very high angular velocity, the raw will succumb to centrifugal force first for lack of bonding between proteins
8) churn (rotate) each egg between hands, applying little (soft) pressure, the boiled egg will start cracking with small cracks vis-a-vis raw
9) light reflects differently from boiled vis a vis raw in a dark room
10) Roll the first egg with velocity 'V' towards other second one which is stationary, then strike the second one at velocity 'V' towards the first one. Velocity remains exactly same in both cases. The one that traverses lesser when momentum is transferred, is the raw egg.