Actually, I DO know where they've been
I've been thinking today about all the things our hands do. Today mine have:
Hemmed a wedding gown
Installed a new motorcycle battery
Tuned Cam's guitar
Petted a Pooch
Now they're typing. After that they'll knit a while, then cook dinner. Then they'll fold in prayer, work a knife and fork, and later do the washing up. They'll smooth the brows I kiss goodnight, turn the knobs on the washer and dryer (again), and then hold a book, at least until the eyes above them fall shut.
Where have your hands been today?