One aim of this screening is to find compounds that block communication in some species but leave others undisturbed.

ECONOMIST: Novel antibiotics

Finally, hiding messages widely amid otherwise-legitimate content makes it difficult for a censor to block communication effectively without also causing significant disruption to innocuous users.

ECONOMIST: A new way of beating the web��s censors

Jamming devices in the Sistine Chapel should block all electronic communication and anyone tweeting would in any case risk being excommunicated.

BBC: Rome conclave: Cardinals begin voting for new Pope

If this approach fails, you can always just block the offending type of communication.

WSJ: Ground Rules for Digital Communication With Friends and Family

"A major stumbling block is the lack of cohesion and communication, between the policy makers in the relevant government departments, " says Ms Sibanda.

BBC: Women are central to feeding Africa

However Gabon's Communication Minister, Blaise Louembe, said he had acted to block the site before the service launched in order to "protect intellectual property rights".

BBC: Megaupload sequel faces Gabon's suspension order setback

Dr. Block is co-leading a research effort to get a Serious Illness Communication Checklist put in place much more broadly.

FORBES: Why 5% of Patients Create 50% of Health Care Costs