Learn something new every day; they tell you it will keep you young. I don't know about that, but at least it keeps me interested.
I've been learning how to swap backgrounds on my photos. I keep forgetting the commands, so I worked far too long on it last night to do a blog post afterwards. Here's what held me up:
This is fun! Not exactly appopriate for insect and bird photos, unless I mention at the time that the background has been changed, but it may be helpful when the insect in question prefers the wood of my desk to the leaf I have so carefully provided.