I'm a big fan of Wikipedia. Most of my editing is just fixing minor things, like formatting or completeness, but when I can find anything missing, I do whatever I can to fix it. My fields of knowledge include computers, physics and, maths.
I tend not to focus on any specific topics, but rather just fix articles I am reading when I notice errors, ommisions or problems with them. Although the articles I read tend to be in the areas I like, so most of my edits will be there.
I've recently become interested in cryptography. For example, I know that putting f03c4c789fb1b11b00f5ea608eebb9f5012be568 here will be enough to later prove account ownership if i forget my password again, even though wikipedia only allows a single email address. It's a hash of some personal information; if you already know the PI (or if some unauthenticated stranger is telling it to you), then yep, it's my PI. If you don't know the PI, you can't reverse a hash; and it remains private. See, I just invented a crypto.
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