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1According to the standard model, what is the elementary constituent of nature?

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2How thick is a string?

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3What is the weakest force of nature?

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4Which fundamental forces does the standard model describe?

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5What does it mean to describe a particle as “elementary” or “fundamental”?

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6What are the problems with string theory today?

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7The equivalence principle refers to which phenomenon?

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8The uncertainty principle is a feature of which theoretical framework?

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9Has the universe always been the same size?

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10How did black holes get their name?

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11What is the messenger particle of electromagnetism?

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12How does the existence of quantum foam clash with Einstein’s general theory of relativity?

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13After the first superstring revolution, how many viable versions of string theory emerged?

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14How many dimensions of space does the current formulation of string theory require to be viable?

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15Why did the existence of a tachyon bring about the collapse of bosonic string theory?

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16Bosonic and fermionic vibrational patterns differ by how much?

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17What does the M in M-theory stand for?

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18How many dimensions does a Calabi-Yau space have?

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19Who was the first scientist to argue that light exhibits wave properties?

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20What is the basic principle underlying special relativity?

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21What do string theorists think that the extra dimensions of space will look like?

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22Supersymmetry predicts what about the elementary particles?

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23Which of the following particles is thought to be massless?

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24Which small-scale phenomenon creates the incompatibility between general relativity and quantum mechanics?

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25What is the term for the approximations string theorists much make in their calculations?