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Time for a Road Trip

One of my students, C.W. (Bellingham), sent me this e-mail note: "My boyfriend (D.K.) is going on a road trip to California and was searching for things to see along the way and found this..."

This note made me curious...any idea what the "find" was?

A hint...it is connected to Pi-Day!

Another hint...It can be found at the Washington Park Max station in Portland (OR) [US Hwy 26, SW Canyon Rd exit]. The 260 ft. underground station has significant facts engraved on the wall...e.g. a value of Pi.

But, unfortunately, the engraved value is wrong from the second line on!

Was it intentional?

Thanks C.W. These odd things make my day!