An app can be as simple as a program that turns a mobile phone into a flashlight to light your way at night.

VOA: special.2011.03.22

"Some of these inventors have been designers of the human genome sequencer, incredible technologies around focusing sound in the same way have been able to focus light with lasers, health technologies like the stair-climbing wheelchair and a portable dialysis machine,".

VOA: standard.2009.12.18