Note to everyone else: the “ranked in three” is not mandatory to figure this out. That one is kind of a bonus tip for the engineers who were paying attention in classes 
sure sure sure – just rub it in… yeah i guess i need to dig deep… been a while since i’ve used my studies or that field LOL
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Very close. But again, like I was saying to @JazzyS above, think more abstractly.
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I keep thinking I’m gonna go to bed but this thread is blowing up here. My wife is sitting beside me in bed trying to figure this out too.
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A lever has three part quality to it?
In sense of inside the body it would make sense as the joints (especially elbow and knee) and yeah – so many daily objects that would fit – i literally had tongs in my hands when I was reading this riddle earlier 
I hope its something else cause i will kick myself.
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— oh sweet god – sorry Matt – see what you started! What thoughts does your wife have? I tried to get my siblings involved but they gave up hours ago
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Oh good lord !!! Thank you for making my brain work and hurt
Alright…you get some rest …
I may need time to come up with one. . someone else is welcome to jump in if they have one
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My wife figured it out at about the same time you did. She said the answer then I looked at the screen and saw your answer.
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Oh thank you thank you for getting it!! Now I can sleep tonight 
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Oh i’m grateful that we both got it and we all can sleep tonight @JoeDogs
That was a tough one – you really do have some doozies Matt - thank you!
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I am in the sky but also in the ground. When you study me, no matter how long, I will always end with an f. I may be in your yard but not in your house.
What am I?
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I’m just talking through things here - I don’t think any of these are the answer but they are popping into my head
Nitrogen (in the sky/air and the ground; but problem: it’s also in the house)
What words end with f?
Clef
Ref(eree)
…
Hmmm. This is a good one.
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Oh good 
. It took forever to find something.
Like your thinking process…keep going…let me know if and when you need a hint
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Force? In the sense of physics. Forces.
But those are also in your house…
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Leaf? Probably not the answer 
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Oh that’s good but not it.
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What??? Have more confidence my friend
You got it!!! 
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Ooooohhhhhh yeah! Boom!
Way to go @TeaCosy 
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I gotta make my house cleaner. Too many leaves on my boots
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