This week mine was homemade soda. Fermented sodas, citric acid + bicarbonate sodas, different juices and flavors like lime + lemon + cherry and pomegranate or mango peach or cola (homemade knock off)
Geology. I found a professor on youtube (Nick Zentner) who puts up lecture series and seminars. There are so many mysteries and amazing things to learn.
I just moved and won't have home internet until tuesday, so I downloaded his entire geology 101 to watch while unpacking.