This post immediately brought me back to my own childhood where playing in the sink and tub were wondrous times. While bath time for hygiene purposes wasn't my priority, I found no end to enjoyment and discovery. The faucet and drain had many useful and creative purposes. There were 6 of us kids and only one tub in our first house so hot water was rationed. There was the inevitable parental call of "Times up!" and I'd have conclude my experiments until the next session. I got to relive this fascination through my own kids later.
So we can now play with our sinks in the name of science and not childhood. Still sounds like another excuse to go back to
The House at Pooh Corner
Well, not not exactly, but it apparently is possible to apply similar physics to the 'white hole' phenomenon that most of us have observed in our kitchen sinks. Who knew plumbing was so complex?
How to Make a White Hole in Your Kitchen Sink | Wired Science | Wired.com
When a stream of tap water hits the flat surface of the sink, it spreads out into a thin disc bounded by a raised lip, called the hydraulic jump. Physicists' puzzlement with this jump dates back to Lord Rayleigh in 1914. More recently, physicists have suggested that, if the water waves inside the disc move faster than the waves outside, the jump could serve as an analogue event horizon. Water can approach the ring from outside, but it can't get in.
"The jump would therefore constitute a one-directional membrane or white hole," wrote physicist Gil Jannes and Germain Rousseaux of the University of Nice Sophia Antipolis in France and colleagues in a study on ArXiv Oct. 8. "Surface waves outside the jump cannot penetrate in the inner region; they are trapped outside in precisely the same sense as light is trapped inside a black hole."