Oil Drop Timer: more fluid dynamics fun- this time with immiscible liquids (typically, colored oils in kerosine) in two connected containers with interesting semi-translucent white and opaque black oils in a variation on the bubble timer theme. The oil in each container falls through a small drop forming hole in between clear walls of acrylic- note how surface tension forms the drops into nearly perfect circles and regulates the size of the drop formation. In addition the drops fall at terminal