Dr.CardioMD said:Start from the measurement rather than the conclusion.
No disagreement, though the timescale matters more than the mechanism here. Most of what looks like a difference in kind turns out to be a difference in how long somebody waited.
TomTeleRx said:Right, and one flattering data point from a group buy is not consistency.
Genuinely useful, thank you. I had the facts and not the framework.
Dr.CardioMD said:Start from the measurement rather than the conclusion.
I read this differently from Dr.CardioMD, on substance rather than tone. I think the framing smuggles in the conclusion. Ask it the other way round and the obvious answer reverses, which usually means the question is doing the work.
That is the short version; the long version is somebody else's post.
Sigma-Aldrich — Research-Grade Standards
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Shop Reference StandardsThe figures, for anyone assembling their own picture. For anyone reading later: the numbers in this thread are worth checking against a primary source before you act on them, including mine. Half the figures circulating in this community trace back to a secondary summary that dropped a qualifier.
Moderator note: two posts asking for a source have been merged into one. Please search the thread before asking again. Tagging this one for the weekly digest.