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As unfortunate as we are to have lost an individual of such brilliance 60 years ago, I am confident his work will be both valued and expanded upon for at least 60 more years to come. 
Help us out that don’t know what happened 60 years ago today…
Just Google April 18, 1955
Google is your friend
[spoiler]
On April 18 1955 Albert Einstein died at Princeton Hospital.
[/spoiler]
Aptil 18 is also the day of Paul Revere’s “midnight ride” (1775), the SF earthquake (1906), and the day that BBC said there was no news to broadcast and played piano music instead (1930).
Interestingly relevant article: https://medium.com/backchannel/yes-i-found-einstein-s-brain-c3834429e4d5
R.I.P., Einstein… 60 years later…
Quiz: What was Einstein’s last significant contribution to modern physics?
No Googling please…
E = MC^2? I know that was pretty late.
No, actually that was published in 1905, Einstein’s “Miracle Year” when he first burst on the scene and started the era of modern physics while he was yet a patent clerk.
He helped to describe a theoretical atomic bomb in early WWII, probably around 1941. I think that he also had some key contributions to the Manhattan project through 1945 as well.
I’m sure he did more after WWII though.
No googling.
But I did search CD to find this old post of mine circa 2005, which mentions a book by Anthony Zee titled “An Old Man’s Toy”.
Gravity. It’s not just a good idea, it’s the law.
Ah. Brings back very pleasant memories from years gone by: sitting in the minivan in the late summer and early fall under a shade tree with all the windows, both sliding doors, and the tailgate open, reading Walter Isaacson’s Einstein: His Life and Universe … while my golden retriever keeps a lookout to alert me when my daughter is dismissed from her music/drama class. It doesn’t get any better than that.
Something to do with the cosmological constant? aka his greatest blunder, aka dark energy.
His only significant scientific (vice humanitarian) contributions after WWII that I can recall were continued arguments in favor of hidden variables and kicking off unified field theory. Hidden variables was later disproven, though he shaped these experiments. Unified field theory is sort of turning into an “Einstein’s Last Theorem” sort of problem. I’m not really happy with either answer, but I’ll go with “creating Unified Field Theory”.