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Railroad tracks, a horses ass... and rockets! [Long]

The US standard railroad gauge (the distance between two rails) is 4 feet 8.5 inches... an exceedingly odd number.

Why was that gauge used?

Because a number of the early railroad lines in the US were built to fit standard-gauge locomotives manufactured by English railroad pioneer G...

Invitation to a Scientists' ball

Some of the replies from the scientists invited:

Pierre and Marie Curie were radiating enthusiasm.

Einstein thought it would be relatively easy to attend.

Volta was electrified and Archimedes, buoyant at the thought.

Ampere was worried he wasn't up to current re...

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