Though more consequences are likely to develop in the post-9/11 era, the war on terror, heightened government surveillance and Islamophobia are notable legacies of this early 21st century tragedy.
Warning Syrians of approaching airstrikes via social media is helping save lives.
Terrorists are wealthy. They're poor. They're Christian. They're atheists. They come from all over. That's why US counterterrorism efforts must be more nuanced than just barring Muslims.
Indonesia has worked hard to block homegrown terrorist cells, but the involvement of children as suicide bombers in recent attacks has raised concerns that de-radicalisation programmes aren't working.
No country is immune to terrorism, but de-radicalizing people who have been attracted to terrorist organizations like ISIS can work.