To play this video you need to enable JavaScript. Do you know the 'proper' way to behave during meals? And what would be the worst thing someone could do while eating? This episode is all about ...

Abstract: Monitoring water quality of inland lakes and reservoirs is a great concern for the public and government in China. Water turbidity is a reliable and direct indicator that can reflect the ...

Can you chip in? As an independent nonprofit, the Internet Archive is fighting for universal access to quality information. We build and maintain all our own systems, but we don’t charge for access, ...

The code has been copied to your clipboard. The URL has been copied to your clipboard Learning English use a limited vocabulary and are read at a slower pace than VOA's other English broadcasts.

To play this video you need to enable JavaScript. We all remember playgrounds when we were children – slides, swings and climbing frames. But have you heard of the new playgrounds which are designed ...