The the event of surviving an apocalypse, the skills of foraging and, importantly, how to cook your finds so that they don't kill you will probably be valued quite highly. Thanks to Harvard University you can spend 14 weeks learning how to cook microbes and fungi - for free. You could also listen to this podcast but I wouldn't fancy your chances of surviving much beyond the apocalypse based on our scant knowledge.
Heather also found, and went on to sign up for, a free online course on the Science of Happiness. We'll give her 8 weeks and demand she shares all that she has learned, shall we?
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