The machine blends iron, bleach and sodium hydroxide to form a dark purple liquid mixture of ferrate, salt and water that gets metered into the water supply. (The color disappears instantly as it reacts with the water.) Common disinfectants ozone and chlorine can turn the water cloudy or, worse, leave behind harmful chemical by-products.

FORBES: Entrepreneurs

How it works:Ones and zeroes of digital data are first converted into checkerboard "pages"of bright and dark pixels using a liquid-crystal panel called a spatial light modulator.

FORBES

At Ta Prohm, to the northeast of Angkor Wat, strangler figs spill like liquid over 39 temples in various stages of ruination, creating a tangle of tipsy roofs and dark hallways.

BBC: The perfect trip: Cambodia