Are you looking at possible tax payments for this year? If you made any improvements to your home, you may be able to lower your tax burden. A home improvement tax deduction can save you money, but you will need to track all your expenses for any home.
Making Rube Goldberg machines is a fun, creative hobby, if you have the patience for it. Though each machine is different, many builders include versions of other people's ideas, tweaking them or linking them in exciting ways.