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Things that confuse you...

How computers work. How software gets written. It is gibberish, not even a proper language but somehow this gibberish tells a bit of metal in a computer or maybe even just a pcb to do something and it does it. Blows my mind.

Similar for phone calls. I can be in Spain, press buttons on a mobile phone and speak to someone as clear as you like in the UK. The spoken word is taken, scrambled, sent, re-assembled and comes out the other end sounding like me. Magic stuff that we take for granted.
 
Radio or TV. How get an areal exactly the bit of information out of the air which makes what I want to see or listen too. Frequency is one bit of it, but what after that?
 
Cycle helmets not being compulsory.
Cucumber, garlic, onions and ketchup ................. I could go on.
The new handball laws.
Skype ........................ 12,000 miles and it's like they're standing next to you.
Man United's transfer policy.
 
So much confuses - me but for starters. Bike gears. So the left shifter moves the chain on the front chain ring and the right one the rear. So how come the front one has to be in the big ring to go up a gear and the rear one the opposite? How come the bigger chain ring on the front adds e thetension and the opposite on the back? Is it termed "up" or "down" a gear when you change to add resistance??

On my hybrid there is a middle front chain ring to contend with and, whilst the numbers tell me which gear I'm in, I have to take a moment everytime to think "am I moving the chain up or down on the front and/or up or down on the rear to figure which shifter to use". So I know if it's using gravity it's the easy flick changer and if it's moving up the rings it's the other one but why are they opposite??
If you look down on the gears from the rear wheel
The crank (big one ) goes from small on left to big on right.
The rear wheel gears go from big to small left to right.
Because the chain is on the same side of the frame they are opposite.

I use thum easy down a gear ,finger hard up a gear.
 
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