(Rebecca's POV)
My phone rings at 7:14 on a Tuesday evening.
The screen says JACK.
I answer it expecting the usual four-minute check-in — how was school, yes you can have extra cookies, goodnight — and instead my son says:
"Mom. How does K2 know if a kid is scared?"
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I set down the soldering iron.
The workshop goes quiet around me. Just the low hum of the ventilation system and my pulse, which has kicked up without permission.
Not hi Mom or guess what happened today or can I stay up late.
A question. Technical. Direct.
I pull up a stool and lean against the workbench.
"You want the real answer?"
"Yeah."
No hesitation. His voice steady.
"Okay."
I take a breath. Let the answer assemble the way it does when I'm teaching — not simplified, not softened, just clear.
"K2 has an
