I celebrate #PiDay2021 in my own way. To me pi will always be about this. 
My first physics result: "Measurement of the Current-Phase Relation of SFS pi-Josephson junctions" with magnificent junctions from Chernogolovka, and experiments done in Urbana: arxiv.org/abs/cond-mat/0…
We also hunted second-order Josephson effect at 0-pi transition, where that randomly wiggling purple trace is. I did not find it. I remember Leggett asking 'why is he graduating?'. The team found it shortly after I left. But it took 10 years to publish! arxiv.org/abs/1805.12546
The 2003 experiment which I was and am very proud of, was rejected from PRL. Not enough novelty... It gave me first taste of publishing. (Nature Physics appeared in 2005, so PRL was it!). 15 years later 2nd experiment got in PRL, though everyone moved on to other topics. Irony!
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