Agree with Allen. Love the CO2 example, which is fairly well known that CO2
lags warming but, since it does not fit the template, was reversed to fit.
The variables you are controlling in the lab are usually not controllable in
the wild. The variable is not the substance that you are testing but all the
other things that can influence the test or trial.
Which is why a lab setting is preferable since you at least have some
control over variables.
Bill Truesdell
Bath, Maine
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