Mnemonics can be helpful in learning a language:

http://en.wikipedia.org/wiki/Mnemonic#For_foreign-language_acquisition

Although Duolingo already allows people to post questions and insights, it could do more to specifically encourage the crowdsourcing of mnemonics to help people learn words more quickly.

Taking it further, Duolingo could even look at how well these mnemonics work for various kinds of people so it could recommend ones that are more likely to work for you in various contexts.

What do you think?