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i dont know the answer of this question sorry some one help him
When Dolley was in the White House, she made many contributions for the United States. One Easter at the President’s house, Dolley came up with an idea. She took Easter eggs and made a game out of it. She welcomed all people to come out on the big front yard of the White House. There, with their eggs, all the children got to play. This became known as the Egg Roll. She made people feel happy and cheerful . She took command of the White House , she also saved many important things when the British started to get closer to the White House .
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Feudal Japanese and European societies were built on a system of hereditary classes. The nobles were at the top, followed by warriors, with tenant farmers or serfs below. There was very little social mobility; the children of peasants became peasants, while the children of lords became lords and ladies
europe Feudalism was a political system in which nobles were granted the use of land that legally belonged to the king. In return, the nobles agreed to give their loyalty and military services to the king. Feudalism developed not only in Europe but also in countries like Japan.
If you meant Denton Cooley, he was the first person to implant an artificial heart in 1969.