For example, lightning can create tubes of glass when it strikes sand that has the right combination of minerals.

VOA: special.2009.09.16

Mister Sharmarke says piracy can only be prevented when Somalia has a government that can enforce its own laws.

VOA: special.2009.04.25

Ships no longer in use contain dangerous materials which can be released into the environment when they are taken apart.

VOA: special.2009.04.27

The leaves make good salads when the plants are young, and the greens can be cooked when the plants are older.

VOA: special.2010.03.02

When it is cold outside, the president and his family can warm up near one of the White House's twenty-eight fireplaces.

VOA: special.2009.05.08

It had a long title: "When You Want 'Em,You Can't Get 'Em, When You've Got 'Em,You Don't Want 'Em."

VOA: special.2009.02.08

Also,you can monkey around when you feel like doing something, but have no firm idea of what to do.

VOA: special.2011.03.13

The American Academy of Pediatrics says some poisons can cause additional damage when they come back up the throat.

VOA: special.2009.08.11

People can also cause a blockage when they try to clean out their ears, but only push the wax deeper inside.

VOA: special.2010.03.31

Progress on a work plan for securing nuclear materials can be discussed when South Korea holds the next summit in two years.

VOA: special.2010.04.17

There was nothing I could do. When you have this kind of a problem, you can only take care of your body.

VOA: special.2010.08.09

And so when you can find an artifact that very comfortably dates the site to the appropriate period, that's exciting for an archeologist."

VOA: special.2011.07.26

It can be treated when found early, but once it grows the chances of survival drop sharply.

VOA: special.2009.05.13

She says she wants the students to know that even when facing hard times, they can succeed.

VOA: special.2009.01.28