Trayvon Martin was just 17 — the same age LeBron James’ oldest child, Bronny, is now — when he was shot and killed by neighborhood watch volunteer George Zimmerman 10 years ago this week. James’ response to Martin’s death — including a famous tweet of the Miami Heat with their hoodies pulled up — was the start of a public commitment to social activism. “Until you know who you are, it’s hard to speak for other people. Or speak for anything. You got to be comfortable with yourself,” James told ESPN earlier this month when asked about Martin’s death. “I think it’s unfortunate that we, as a society sometimes, we want certain people to talk and we want certain people to [take on issues]. Like, ‘Why aren’t you speaking for [this community]?’ I think for me, when I was younger, I wasn’t in that position to do that.”