Science Juice is a glowing liquid substance seen pumped through conduits throughout Quadwrangle Manor. An energy source, superconductor, and able to amplify electric frequencies, it is stored in IDS Batteries and used by IDS Receptacles to widen interdimensional rifts allowing someone holding an IDS Device to pass into alternate dimensions. It is also used as a source of material for DOLLIs cloning abilities.
Science Juice is normally yellow, though it appears as different colors depending on what dimension the player is currently in, the same color as the juice stored in the battery for that dimension.
Professor Quadwrangle also points out that Science Juice is radioactive, flammable and also not safe to drink.
Also, if you fall into one of the various pits of Science Juice located throughout the game you will die, no matter what dimension you are in.
The Science Juice comes from a disclosed biological animal and it is most probably Things the Dog. Proof of evidence can be found by going to the R&D Lab, having all 4 IDS Batteries and the portrait on Things and radiation. Play around and all 5 colours of the Science Juice can be seen.