** Either they built an inferior machine or you have to tune it just right to enlarge something without making it explode. Wayne managed to enlarge a turkey at the end of the first movie, so it's clear ''he'' knows how to do it.
** It's really hard to say. On one hand Wayne isn't inspired into how to fix it until partway into the film, rather than immediately just tell them the beam was too strong, even though it was the same problem as the shrink ray. On the other hand it could be that enlarging machine at the lab works different, because Wayne was able to set up his original machine to do the same thing to enlarge Diane in short order. On the other other hand he wasn't sure if it work work properly, saying he was afraid Diane would just start randomly growing on contact to electricity rather than instantly grow to Adam's size, even though it works as intended as far as we see.
** The answer is simple. Hendrickson would not let Wayne get a word in edgewise, and he didn't give him access to the data in the lab in the first place.
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