The Continental Congress. 1  In the First Continental Congress, Patrick Henry, a delegate from Virginia, made the bold statement that I am not a Virginian, I am an American. 2  At the time of the congress, there were around 2.5 million people living in the United States.
Next Question. The main ingredient in eggshells is calcium carbonate (the same brittle white stuff that chalk, limestone, cave stalactites, sea shells, coral, and pearls are made of). The shell itself is about 95% CaCO 3 (which is also the main ingredient in sea shells).
The answer, they say, is the chicken. Researchers found that the formation of egg shells relies on a protein found only in a chicken's ovaries. Scientists have discovered that eggs can only have been laid by chickens, thus solving the puzzle. Therefore, an egg can exist only if it has been inside a chicken. The protein-called ovocledidin-17, or OC-17 - acts as a catalyst to speed up the development of the shell. This hard shell is essential to house the yolk and its protective fluids while the chick develops inside.