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Earned on 27 Dec 2012 for commenting on Problem 1140. RMS value from a set of observations.
Create a problem.
Earned on 28 Dec 2012 for first solving Problem 1147. Possible Outcomes of American Roulette.
Solve a problem with a best solution.
Solve all the problems in CUP Challenge problem group.
Must have 50 solvers for a problem you created.
Solve all the problems in Tiles Challenge problem group.
Solve all the problems in Cody Challenge problem group.
Solve all the problems in ASEE Challenge problem group.
Create 10 problems.
Solve 500 problems.
Must receive 25 total likes for the problems you created.
Must receive 10 likes for a solution you submitted.
Must receive 50 total likes for the solutions you submitted.
Must receive 10 likes for a problem you created.