Boiled Egg Vs Unboiled Egg

Ever been fooled by egg? Cannot make a difference between boiled and un-boiled egg? Just by seeing and touching it will make no result. Here's the simple trick.

We just have to spinned as if it's a whirligig. Because the density of boiled egg, it will be very easy to spin. Contrary with unboiled egg, the liquidity of it's structure causing irregularity of circle. Unboiled egg will keep moving and and it's difficult to stay in balance.