7. CHEMISTRY - oh my gosh did you see the latest minecraft update. The education edition (not encouraging you to copy), but I am

. The science skill should increase your ability to make certain things. Like gunpowder etc.
So many ideas where the science skill could be more useful.
a) Make hydrogen gas - for really high level hydrogen fuel cell, or really low level (unstable it could blow) gas bomb
b) Make breathing apparatus for underwater (think butane bottle, hose, helmet)
C) Growing crops better - e.g. PH and Soil (Think red cabbage
D) Make Soap - Gain health back due to hygene (Need fat, charcol)
E) Making preserved food in jars rather than just food in a can. Allow food to go off or lose its value over time unless it's preserved
F) GLOWSTICKS! 24 hours time limit.. early game use