50 dangerous things you should let your kids do: This guy has a great point. Baby-proofing the heck out of everything is maiming our children's abilities to learn and discover. There are some dangerous things you need to let them do, UNDER SUPERVISION, OF COURSE. Doing these things utilize different parts of the brain, and if those parts of the brain do not get used, they tend to atrophy over time. LET YOUR CHILDREN LEARN.