Gever Tulley: 5 dangerous things you should let your kids do
I watched this more than a decade ago and still find myself quoting from it to other parents a few times a year. If you have kids keeping them safe is your first priority, and to do that well you have to teach them how to deal with dangerous things. A great lesson for adults and kids. And yes, both my daughter have own a knife.
P.S. this is a TED talk from before TED talks were polished and uniform presentations. Much more genuine and human.