The human brain has more connections than stars in the Milky Way.
Why it is true
The brain has about 100 trillion synapses, while the Milky Way has 100-400 billion stars.
Source: Neuroscience
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This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.