A stone gate barred the entrance to Trinity College. Cut into the gate was a small wooden door. I stepped through it. A porter in a black overcoat and bowler hat showed me around the college, leading me through Great Court, the largest of the courtyards. We walked through a stone passageway and into a covered corridor whose stone was the color of ripe wheat.

"This is the north cloister," the porter said. "It is here that Newton stomped his foot to measure the echo, calculating the speed of sound for the first time."

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