1. She is Marie Curie. She is a French physicist. However, she was born in Poland. She discovered the pure radium. She was awarded two Nobel Prizes. [She was the only person to be awarded two Nobel Prizes.]

(Would you like to check the passages above? Check them please.)

2. He discovered "the Law of Universal Gravitation" and "the Three Laws of Motion." [Motion".]
(Is this passage corect? What is the correct position of period?)

#1 would read more smoothly if you start combining sentences so you don't have so many short, simple sentences in succession. Like this:

Marie Curie was a French physicist who was born in Poland. She discovered pure radium, and she is the only person to have ever been awarded two Nobel Prizes.

#2 The sentence is correct, and your placement of the period before the closing quotation marks is also correct.

1. The passages you provided about Marie Curie are correct. Marie Curie was indeed a French physicist of Polish origin. She made significant contributions to the field of physics, particularly in the discovery of pure radium. She was honored with two Nobel Prizes, making her the only person to have ever received this prestigious award twice.

To verify this information and learn more about Marie Curie, you can conduct a quick search using reliable sources such as books, articles, or reputable websites that specialize in scientific biographies or Nobel Prize laureates. This will help you gather more in-depth information about her life, achievements, and contributions to science.

2. The passage you provided about the discoveries of "the Law of Universal Gravitation" and "the Three Laws of Motion" is partially correct. However, there seems to be a question about the positioning of the period at the end of the sentence.

To clarify, here's the corrected version of the passage:

"He discovered the Law of Universal Gravitation and the Three Laws of Motion."

Sir Isaac Newton, a prominent English physicist and mathematician, indeed made significant contributions to our understanding of physics. His discovery of the Law of Universal Gravitation and formulation of the Three Laws of Motion are among his most significant accomplishments.

To confirm this information and learn more about Sir Isaac Newton and his contributions, you can refer to reliable sources such as books, scientific journals, or reputable websites that focus on physics or the history of science. These sources will provide you with accurate and detailed information on Newton's work.