Tiny technology that can find pollution in South Africa's water and trap it

Nanotechnology is the use of materials that are one-billionth of a meter (a nanometer) in size. One of its potential uses is to clean up whatever is contaminating water supplies. Analytical chemist Philiswa Nomngongo, a leading researcher in nanotechnology for water in South Africa, tells The Conversation Africa what kinds of devices are being produced with nanotechnology and what they can do.