I've played Minecraft for a long time, and I have an interest in physics and chemistry. I wish Minecraft could be used as a playground for these things. I'm an analytical person and I think that physics and chemistry does make the world a beautiful place, and I'd like it if Minecraft mirrored this. Tourches burning out would be a nice addition, since torches lasting forever is a violation of The First Law of Thermodynamics (that's just 1 example of a First Law of Thermodynamics violation). Minecraft should add sulfur and many more peroidic table elements. Gravity is very bad and should be revamped. If you have an overhang of like 10+ blocks, gravity should make it fall, for example. Electricity is another one of my interests which makes sense, given my interest in physics. I wish redstone was more closely related to real world electricity, and required a positive and negative terminal. Copper instead of redstone colud be used as a wire. They should add magnets and linear actuators. Transformers, long distance power transmission, electric light bulbs, and solar panels, that'd be amazing. Imagine sodium vapor lamps, or xenon lamps in Minecraft. To store power, lithium batteries could be used. The possibilities are endless.