"So remember to look up at the stars and not down at your feet. Try to make sense of what you see and hold on to that childlike wonder about what makes the universe exist."
"It is impossible to imagine a four-dimensional space. I personally find it hard enough to visualize a three-dimensional space!"
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Source: Stephen Hawking (2009). “A Brief History Of Time: From Big Bang To Black Holes”, p.25, Random House
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