I have my seniors do an etymology paper each year, and it always amazes me the words they choose (or attempt to choose) to do their papers on.
A couple of years back, one of my students did "school", and laughed to find the following:
O.E... also "leisure, spare time," originally "a holding back, a keeping clear," from skhein "to get" + -ole by analogy with bole "a throw," stole "outfit," etc. The original notion is "leisure," which passed to "otiose discussion," then "place for such."
We had a grand time talking about how a word that now connotates drudgery and work to students, originally centered around "leisure time".