They could easily find out about hit points and how many each individual had through the use of needles. I mean, they deal 1 damage, and if you get a million apprentices with a million needles, you could easily quantify the total amount of times an individual can be 'poked' before collapse. They could then test the various healing methods to determine a rough average healing, maximum, and minimum healing.
I also believe they may have the technology to determine where babies come from
Slainte,
-Loonook.
