Receiving interest from a bank, dividends from stocks, etc.
Doing הכנה (Hachana) With the Yom Tov of סוכות (Sukkos);
Ear Plugs, Examples of Strengthening an Item on Shabbos, Hairspray, Stretching Shoes, etc.
(Temporary Ohel) How to work with a covering when it is attached with hinges or any other attachment;