A few weeks ago I started reading BEEKEEPING STUDY NOTES For the BBKA Certificate in BEEKEEPING HUSBANDRY (their u/lc, not mine!).
On page 130 it reads, "Note the weight of a worker bee = c.90mg and that 1 lb of bees contains c. 5000 bees" and repeats the same jumble of imperial and metric units on page 154.
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