"Novel Nut November" -- go do it in new places everyday! Get that excitement and freshness going for the entire month. Bingo and lifetime achievement unlocked with a dash of public indecency mixed in.
I never callus mine. I trim my overgrown ones with a wide "^” shape (upside down 'V'). I stick them in a jar of water like yours and let it face the sun. Occasionally refill the water and rinse if necessary -- sprouts roots like crazy and even further sprouts. Fun fact: they thrive in water!!