Staff tell an apocryphal-sounding anecdote from the Search for Extraterrestrial Intelligence, when a promising signal turned out be a technician warming his lunch at the Arecibo Observatory in Puerto Rico.

BBC: Aye to the telescope

As he describes the Clinton team's evolution from relative impotence in Bosnia during its early months to dynamic involvement in 1995, Mr Halberstam gives a sympathetic hearing to the foreign-service officers who protested strongly because America seemed to be condoning Serb atrocities, about which the United States, with its signal and satellite intelligence, was uniquely well informed.

ECONOMIST: Washington chronicle

Amos Yadlin, a former head of Israel's military intelligence, said the strike is a signal to Syria's ally, Tehran, that Israel is serious about the red lines it has set.

NPR: Israeli Warplanes Strike Syria In Escalation

But the only signal I've ever seen where one serious group of British intelligence thought it might be about to happen was there.

BBC

In the future, we hope that a global army of open-source code developers, students and other experts in digital signal processing, as well as citizen scientists willing to lend their intelligence to our exploration, will have access to the same technology and join our quest.

CNN: What if there's somebody else out there?