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.