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Quantum foam - grainy bumps in the fabric of space-time - might explain why light from a distant galaxy arrived four minutes later than expected, offering

Throughout our history, mankind has created tools the same way, essentially using the top-down approach. Think about it. In the stone age, a sharp cutting tool was fashioned by using a larger stone to chip away pieces until the cutting stone was sharp enough. Today, a computer chip is made by a large laser that etches the circuits into a piece of silicon.