Answer:
politics will always have vast amounts of material and comes with the bonus of removing you from half of your friends. Try politics. Start with government involvement in free-market economies.
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commas, dashes, or parentheses
Nonessential appositive phrases can be separated from the rest of a sentence in three ways—with commas, with dashes, or with parentheses. Let’s look at example sentences that essentially mean the same thing:
The best pet in the world, a dog, will always be known as “man’s best friend.”
The best pet in the world—a dog—will always be known as “man’s best friend.”
The best pet in the world (a dog) will always be known as “man’s best friend.”
Above-on top of something
below- under something
up- "going up"
down- "go down the street"