People suffering from autism could be far more vulnerable to falling under the spell of terror organisations on the look-out for new recruits.
Security guarantees are impossible, but too many dangerous individuals are falling through the cracks.
An attack at Manchester Arena has sent shock waves around the world, and again raised questions about safety in public places.
Was the London attacker acting alone? Was he really a soldier of the Islamic State? Research on the nature of jihadism in the West reveals possible answers.
The ban on electronic devices in cabin luggage overlooks the airports that would be least likely to detect a bomb.
President Trump has asserted that media coverage of terrorist attacks under-represents their actual extent. Analysis of 50 years of news coverage answers this question, and raises others.
Governments need to build trust, especially during a time of heightened tensions around the threat of international terror attacks.