Talking with my youngest daughter has always fascinated me. She's a geek in all the good sense of that word. She may be the most natural engineer I have ever met. Here's a conversation from this morning, word for word:
Caitlin: Can you open the garage door? Use the special button. I am pretending it only works for you and nobody else.
Me: Actually, there are things that work that way. It's called 'biometric security'. It means things that only work when they can identify something unique about your body.
Caitlin: Like a fingerprint! I'm going to build a robot with biometric security that only listens to me.
<pause>
Caitlin: It will use my handprint.
<pause>
Caitlin: That won't work. I am still growing.
<pause>
Caitlin: My voice! It will use my voice.
Then she headed off for second grade.....
See what I mean?
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Tell her to figure out whether there's anything about her eyes that are unique
to her.