Question:
Does the fourth dimension have a practical use in our
lives? Has anyone ever used the fourth dimension to solve a problem?

Replies:
The fourth dimension is part of our lives whether we like it or not. The
fourth dimension is the passage of time. When you make a graph of position
vs. time, you have used the fourth dimension. Because our senses can only
interact with one point on the fourth dimension (the time we call "now"), we
usually don't notice it.

Using the fourth dimension as it works in Einstein's Special Theory of
Relativity is a little more involved. This is because passage of time can
be affected by speed, if speed gets close to the speed of light (three
hundred million meters per second, or three million footbal fields per
second). For most of day-to-day life, the fourth dimension is just the
clock ticking. Using it as a dimension has been used quite a bit with
particles traveling near the speed of light as they travel from other stars.
It is also important inside particle accelerators (like at Argonne National
Laboratory).

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