The best predictor of a woman's involvement in terrorism, whether it's a secular or religious group, is a relationship with a terrorist: her father, brother, husband or even her son. Terrorism becomes a bit of a family business.

The terrorists provide an outlet where with just one action, a raped woman can go from being a source of dishonour to her family to being a source of pride in a culture of martyrdom.

The issue of motherhood is no longer salient. In fact, the very first female bomber for Hamas posed in her last will and testament video with her two kids.

Misuse of the Koran to provide legitimacy for violence is common, particularly in Europe, where terrorists tend not to be well-educated Muslims.

A lot of movements use women's involvement to shame men when recruitment is sagging.

With a civilian target, female bombers tend to be more successful and cause more damage.

Women are secretaries of state and prime ministers - but people still don't expect women to be involved in violence.