Being an active bystander - that is, speaking up or intervening in the face of injustice - feels like the right thing to do when you see something you disagree with.
But it doesn't always go to plan, and your best intentions can backfire.
There's new analysis suggesting that, in schools at least, encouraging kids to intervene isn't always helpful.
So how are you meant to know when it's the right time to stop being a bystander and step up?
