and one hydrophilic layer that allows water to pass - in order to cleanly separate both. Yang says the idea has been tried before with less-than-impressive results. This is because as oil or water ...

Meanwhile, water escapes through the hydrophilic membrane into a separate tank. The liquid is kept moving by continuously pumping small oil drops into the channel.

Choosing between oil-based and water-based skin care can significantly impact your skin's health and overall glow. Here’s what you should know.