Calculus
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Donald Trump This is a section about Calculus!
Calculus is a very important subject about which there is a lot to say.
For example, this sentence. And then another one.
Barack Obama This is a section about Calculus!
Calculus is a very important subject about which there is a lot to say.
For example, this sentence. And then another one.
Wikipedia Bot 
Ciro Santilli Well summarized as "the branch of mathematics that deals with limits".