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Oil is good because it brings us many things but it is toxic and dangerous.
Science is the way from we can learn all things . Science will never die . some negative points of science are it has made bombs through which some people doing wrong things .
Because the cosine of some angles is positive and the cosine of some other angles is negative.
Lots of things. Some of these are: Electrical charge, Ions, Attitudes, Feedback,
Look for a + by the positive terminal and a - by the negative terminal, or red for positive, black for negative. Some batteries have the positive terminal protruding and the negative terminal flat. Or you can get a meter that will tell you which is which,