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15 votes
1 answer

Which specific day of 1964 was the tree Prometheus (WPN-114) cut down?

In 1964, one of the oldest non-clonal living things in the world, Prometheus, a Great Basin bristlecone pine, was cut down. (This is important background information for a story I'm writing, and ...
4 votes
2 answers

What was the technology in pre-war traffic recorders?

In 1936, Nevada was using an automated traffic recorder, a device that counts the number of passing vehicles: The device must have included a vehicle detector and a recording mechanism. Today it ...
11 votes
1 answer

When were public roads cleaned electromagnetically?

In the first half of the 20th century, tires were more often punctured, so metal waste on the roadway was a bigger problem. The book "Lorries, Trucks and Vans 1897-1927" features an electromagnetic ...