this is the kind of calcing power needed

“What’s with you? What’s that thing called? Um…Tree Diagram, was it? Hah, are you
the kind of person that can’t stand it when a machine beats a human at chess?”
Simply put, Tree Diagram was the world’s smartest super computer. It was the ultimate
simulator created under the pretext of being a perfect weather forecaster.
Weather forecasting may sound familiar, but that was a field where things could only be
forecasted. They could not be declared as fact. Because the movements of each of the air
particles that created “weather” were incredibly complex and intertwined with the
butterfly effect and chaos theory, one could say that there was an 80% chance of rain the
next day, but one could not say that it would definitely rain at 9:10:00 AM. That started
to enter into the realm of quantum mechanics.
However, Tree Diagram had moved weather forecasting to weather predicting.
It did not do anything complicated. Basically, if it could perfectly predict the movements
of every particle in the air around the world, there was only one answer it could come up
with.
Tree Diagram had ridiculous enough specs to do that, but some people theorized that its
use for weather forecasting was just a front and it actually had some other true use.
Incidentally, there was one irregular aspect of Tree Diagram’s weather forecasts.
It calculated the weather forecast for an entire month all at once.
There was no real problem with that because it was still accurate, but it still seemed like
unnecessary effort. After all, next month’s weather was much, much more likely to be off
than tomorrow’s weather. If the goal was accurate weather forecasts, it would be better
to redo the calculations each day.
Yet the Tree Diagram used the more difficult method.
It was rumored that the leftover time was used for research simulations.
Drug reactions, physiological reactions, electrical reactions, and all sorts of other things
could be calculated by Tree Diagram and a couple of tests could confirm the answer
given. Being able to create a new drug like that almost sounded crazy. According to the
rumor, there were researchers that did not know how to use a test tube and who did not
like touching lab rats.

- Toaru Majutsu no Index Volume 3 Chapter 2 Part 2