Examlex
If the relative mass of a hydrogen atom is 1/4 that of a helium atom,how many helium atoms would you need to equal the mass of 200 hydrogen atoms?
César Chávez
An American labor leader and civil rights activist who co-founded the United Farm Workers union, fighting for improved working conditions for farm workers in the U.S.
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An American activist and a key member of the Berkeley Free Speech Movement, known for his passionate speeches calling for academic freedom and reform of university policies in the 1960s.
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The social structure, cultural practices, and historical development of the United States, influenced by diverse ethnic backgrounds and ideologies.
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