A simple water pump is helping to improve the lives of poor families in several Asian and African countries.

VOA: special.2009.08.17

Here's a really simple example. Mixing of oil and water.

这有一个很简单的例子，水和油的混合。

麻省理工公开课 - 热力学与动力学课程节选

The simple mechanical pump draws water from a shallow well or nearby stream or river for use in irrigation.

VOA: standard.2009.12.18

Is it the one we see before us here, simple water and soap, the angelic St Maria Goretti?

BBC: Who is the real 'Foxy Knoxy'?

Or "Virtual Water, " a wall chart which transforms arcane UNESCO data about water usage into a simple explainer about water consumption.

CNN: Green designs that don't cost the Earth

Businesses can turn an effort as simple as conserving water in the office into a game.

FORBES: Gaming for Corporate Social Good