Answer: Lubrication
Moving parts of early machines were able to run because of the application of a lubricant such as oil, vaseline or grease.
The history of lubrication has advanced into a discipline known as tribology, which studies interactions between the moving parts of a machine.
By studying friction, wear, and lubrication, engineers are able to design bearings that prolong the useful life of rotating machinery.
Answer:
The United Nations focuses on five main areas: "maintaining peace and security, protecting human rights, delivering humanitarian aid, supporting sustainable development, and upholding international law." UN agencies, such as UN Relief and Works Agency, are generally regarded as international organizations in their own .
Explanation:
Speaker of the house role- is responsible for administering the oath of office to the Members of the U.S. House of Representatives, giving Members permission to speak on the House floor, designating Members to serve as Speaker pro tempore, counting and declaring all votes, appointing Members to committees, sending bills. The house Majority leader role is The leaders serve as spokespersons for their party's positions on issues. The majority leader schedules the daily legislative program and fashions the unanimous consent agreements that govern the time for debate. The house majority whip role The Majority Whip is an elected member of the majority party who assists the Speaker of the House and the majority leader to coordinate ideas on, and garner support for, proposed legislation. The house minority leader role is The minority leader is responsible for leading the minority party in the U.S. House of Representatives. These responsibilities include speaking for the party and its policies, protecting the minority's rights, and nominating minority party Members to committees. The House minority whip role is The majority and minority whips (and their assistants) are responsible for mobilizing votes within their parties on major issues. In the absence of a party floor leader, the whip often serves as acting floor leader. The senate majority leader role is The leaders serve as spokespersons for their party's positions on issues. The majority leader schedules the daily legislative program and fashions the unanimous consent agreements that govern the time for debate. ... The majority leader has also come to speak for the Senate as an institution. The senate majority whip role is The main function of the Majority and Minority Whips is to gather votes of their respective parties on major issues. As the second-ranking members of Senate leadership, if there is no floor leader present, the Whip may become acting floor leader.
The Dred Scott retrial of 1850 concluded that because they had previously resided in a free territory, Dred Scott and his wife Harriet had a right to be freed from slavery.
This 1850 verdict is different from the first trial held following this lawsuit. In 1847, after the Scotts had first sued their owner for freedom, the Missouri Circuit Court ruled that they were still slaves. The Scotts therefore asked for a second hearing in 1850, and won, but later lost the following trials when their owner appealed to higher courts.
Winston Churchill was the prime minister during ww2