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I was on my way home from the shops.
Two cartons of milk, some plastic bottles, and things for dinner.
The plastic bags were cutting into my fingers.
Waiting at the light, I looked at my hand: my fingertips had gone white.
The blood had pooled and stalled.
It wasn’t so heavy that I couldn’t carry it.
But when the whole weight gathers on a thin handle, it’s the fingers alone that scream.
The light changes. I switch hands and start walking.
A thought came to me.
The same weight in a backpack wouldn’t bother me at all.
Why is that?
The answer was area
The weight is the same.
What differed was the area that takes that weight.
A thin handle gathers the weight onto a single point. A backpack strap takes it across a wide area.
The same weight, and only the pain changes.
Why a kitchen knife cuts. Why a thumbtack goes in. Why snowshoes don’t sink into the snow.
It was all about area.
I never imagined that fingers gone numb from a supermarket bag would lead to a story like this.
Could it be
Just then, something crossed my mind.
It was pool.
That small piece of leather on the end of the cue.
The tip.
Isn’t that, too, a story about area?
Why we chalk
When I started playing pool, someone told me, “Chalk up before you shoot.”
I did as I was told.
I didn’t know why.
Chalk creates friction between the tip and the ball.
For the briefest instant of impact, the tip bites into the ball.
The force carries through without slipping away.
That small blue cube was a tool for controlling contact.
The same physics as the supermarket bag.
And the bridge, too
Thinking about it that way, the same thing was happening with my left hand when I got down on a shot.
As a beginner, I supported the cue with just my fingertips.
It was unsteady.
When I watch good players, their whole palm rests on the table.
What held the cue wasn’t the fingers.
It was area.
The wider the support, the less the wobble.
The same physics was there on the table, too.
Insight was somewhere else
It started with a supermarket bag, led to chalk, and led to the bridge.
I wasn’t setting out to study physics.
My fingers just hurt.
But from the moment I wondered “why is that?”, everything began to connect.
Sometimes, reading a book, you find a hint for your work. Sometimes, watching a film, you come across an answer about the people in your life.
Insight hides, more often than you’d think, somewhere else.
That day, and my numb fingers
Even now, carrying supermarket bags makes my fingers hurt.
Some days I still forget my reusable bag.
But thanks to my numb fingers that day, I learned a little physics.
And that physics led to pool.
The world seems to be made of separate pieces, but it is more connected than you’d think.
The road home from the supermarket. The pool hall.
Wherever you stop and wonder “why is that?”, an insight is lying there waiting.
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