The material can harm people who do not know it is there.

VOA: special.2009.11.17

But experts say no-one knows how large the world stockpile of nuclear material is because not every country reports what it's producing.

VOA: standard.2010.04.06

But they also said the material released by WikiLeaks will not undermine the mission in Afghanistan.

VOA: standard.2010.07.30

but the line they dare not cross is to splice human genetic material into an experiment.

VOA: standard.2010.06.09

France is not the first country to look at the non-material aspects of progress.

VOA: standard.2009.09.14

But the acquisition of radioactive material for a so-called 'dirty bomb,' which is radioactive material that is dispersed with a conventional explosive device, that is not that challenging.

VOA: standard.2009.05.01

Sierra Leonean law is clear. Anyone who "maliciously" publishes defamatory material could be put in jail for up to three years, whether or not what they have written is true.

VOA: standard.2009.12.28