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I don’t find it hard to believe. I’ve written tons of notes on my arms and hands when working product support. When I briefly framed houses we would do all our math and diagramming on lumber. Either studs in the wall or scraps from the floor. You write on whatever you have handy.
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I think it makes sense, notebooks are hard to sterilize.
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    > notebooks are hard to sterilize
Washing / sterilizing the lab coat has the same effect as erasing the data written on it.

There isn't a library of lab coats which contain notes written on them, for future consultation.

A notepad page is also easier to permanently sterilize (via incineration) than a lab coat.

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The commenter acknowledges this: "I was always impressed that the laundry managed to get them pristine white again."

I think it's pretty clear they were taking ephemeral notes, not using them for long-term archiving.

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The labcoat is a kind of L1 data cache.
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