"Most of those who qualify as children are smart enough not to touch what they don't understand...."

Surprisingly. And Kaiba knows he can help them understand. It's some of the adults he needs to worry about, honestly.

"But a lock that will keep the most tech-challenged out will be simple enough. Then it should be fairly safe to leave out, as long as we have failsafes to prevent injury. Do a public service announcement on usage and I think we'll have it all covered."