My February Project is Picture a Day. Something inspiring, something cool, something to make you smile or think.
Day 5 (yes I skipped Day 4)
The lava lamp was invented in the 1960s by a British accountant and works due to the Rayleigh-Taylor Instability (which sounds like a Big Bang Theory episode). RT instability happens when two liquids of differing densities mingle, in this case, wax (the “lava”) and the surrounding water-based liquid, but do not dissolve. In the simplest terms, waxy blobs and water are heated by a light bulb in the base of the lamp. The wax heats up, rises to the top, then cool and drops down. Lava lamps went on to become one of the defining images of the 60s, and are still sold today.
Fun Fact: The Doctor Who episode The Wheel in Space (1968) was the first television show to feature lava lamps.
Other sites for more information: