But true office Machiavellis will be pleased to learn that private chats are also possible, since the software can work out who is within earshot of whom, and will transmit sound only to those who should be able to hear it.

ECONOMIST: Information technology

But we can be sure Gen Petraeus will be too canny to let his hair down within the earshot of any journalist.

BBC: McChrystal row reflects Washington nerves

It must have been an unusual experience to be out there as a defense attorney in this case, talking about the verdict within earshot of family members.

NPR: No Model Client: Moussaoui's Lawyer Speaks