This has happened continuously in the US for 174 years. What is it?

Catch up on what you missed with the Question Impossible featured weekday mornings at 7:10 on the Morning Drive with John & Nancy.

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QI Rewind 8-19-24

Catch up on what you missed with the Question Impossible featured weekday mornings at 7:10 on the Mo…

This was first introduced in 1863. What is it?

The last time this happened was in 2006. What is it?