I guess I must have taken one too many Chemistry courses to think of this chapter. But in all seriousness the experiments were really cool to preform. Anyroad,

What would the Beatles do?

John would preform many experiments that include mixing various chemicals with different drugs to see their effects on humans.  (As if cigarettes didn't have enough harmful toxins already)

Paul would invent a special face-cream that would instantly and permanently get rid of any acne or zits. And after that he would go on to do more work on other beauty products.

George would finally invent those instant (just add water) food pellets often seen in cartoons. Then he would research on HDL (High Density Lipoproteins) to find a way to turn any fat laden food super healthy.

Ringo would create a highly evolved Octopus that can play the drums.

What would anyone else think of what they do?

Only stoners would be interested in what John does.

The highest selling market of beauty products would see Paul as their mortal enemy because his line of experimental products sold better. (Because they actually work.)

Some fast food joints would try to get George sued due to him experimenting on food. (Despite the fact that they use meats that are laced with GMOs)

Some conspiracy theorists would get paranoid thinking that Ringo would create an army of super intelligent octopi and use them to take over the world.