You will need:
1) At water faucet.
2) Your kitchen sink.
Turn on your tap so there is a small but steady flow of water onto the surface of the sink. Gently adjust the steady flow of water until a circular disk forms. At the edge of the disk will be a lip of water, raised over the flow.
There! That’s it! A white hole!
You were expecting something more exotic perhaps?
A region of space where waves and particles can enter but not escape is a black hole. A region of space where waves and particles can escape but not enter is a white hole.
According to Technology Review, proof has been found that the lip, called a “hydraulic jump,” is mathematically equivalent to a white hole: the water flow going out of the disc, across the jump, is faster than the speed of the waves going in. The disc is a region of space where waves can escape, but not enter. It is a white hole.