Technically You Need The Extra Dimensions. At First People Didn't Like Them Too Much, But They've Got A Big Benefit, Which Is That The Ability Of String Theory To Describe All The Elementary Particles And Their Forces Along With Gravity Depends On Using The Extra Dimensions. - SearchQuotes

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Technically you need the extra dimensions. At first people didn't like them too much, but they've got a big benefit, which is that the ability of string theory to describe all the elementary particles and their forces along with gravity depends on using the extra dimensions.

Edward Witten

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String theory is an attempt at a deeper description of nature by thinking of an elementary particle not as a little point but as a little loop of vibrating string.

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Having those extra dimensions and therefore many ways the string can vibrate in many different directions turns out to be the key to being able to describe all the particles that we see.

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Even before string theory, especially as physics developed in the 20th century, it turned out that the equations that really work in describing nature with the most generality and the greatest simplicity are very elegant and subtle.

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