
This is a straight line.

These are all straight lines.

If you happen to live on the surface of a sphere, this is a straight line. 
If you live on a space station orbiting a sphere, this is a straight line.

And since we all live in a gravitationally-curved, non-Euclidian universe,
this might be a straight line too.
∼∼∼∼∼∼∼∼∼∼∼∼∼∼∼∼∼∼∼∼∼∼∼∼∼∼∼∼∼∼∼∼∼∼∼∼∼∼∼∼∼∼
If this is a straight line,,,
…then this is definitely a straight line,,, 
…and this is a straight line that helped change a nation.

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
This describes an inifite number of straight lines. 
This is an infinite number of very, very, very short straight lines. This is a nearly infinite number of straight lines. __ . . . . . . . . . . . . . . . __ . . . __ . __ . . __ . . __ __ . . . . . __ . __ . . . . __ . . Statistically speaking, this is at least three straight lines. These are all straight lines. See what I mean? And, as any fan of fantasy fiction can tell you, the forest is a perfect place to fine these straight lines. +h!$ !$ 4 $+24!+ £!∧3🛑 
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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