Old milk can be used to extract gold and other metals from e-waste

An air gel made from old milk can extract extremely pure gold nuggets from discarded computer motherboards.

Rejection electronics, known as E waste, often containing large amounts of gold and other heavy metals. Scientists have found ways to recover precious metals, but these processes often rely on synthetic chemicals that can harm the environment.

Raphael Mazenga At ETH Zurich, Switzerland, and colleagues have developed a method to extract gold from milk-derived e-waste. airgelA type of prison…