i find it quite sad that people don't really acknowledge blue as a scientist near as much as yellow when arguably yellow is less a scientist and more an engineer/coder (and i'm saying this as possibly the biggest yellow fan ever)
so to fix that: have some science-related blue headcanons!
as the alchemist/chemist of the group, blue actually has a fully decked out potion/chem lab. if they're not working on farms or hanging out with the rest of cg, they're probably there working on some strange experiment
blue has an insanely high tolerance to non-edible materials, both naturally and through a built-up resistance. they also have pica, a disorder known for causing the desire to eat non-edible materials. blue has eaten every potion material they've used, no matter how gross or non-edible it is outside of potions. that includes redstone, despite yellow's warning about it (blue fared much better than yellow did due to their high tolerance, luckily)
blue is highly temperature sensitive. useful for knowing if something is brewing (or cooking) at the right temperature, very bad for being dunked in lava
blue knows a LOT about dangerous substances and chemicals. a lot that they really shouldn't know. alan once had to deal with a wellness check after someone saw 'how to make mustard gas' in his search history thanks to blue's curiosity
blue is both a yapper and a listener, but their yapping takes prompting first. if asked any question about chemistry, they can and will launch into a 7 hour lecture you cannot escape from