Not that we care about that in this day and age.

Your memory is amazing. Do you know any useful info?

Absolutely not. I can tell you how various pieces of tech on Starfleet ships works. I can quote episodes. Hell, I can recite that ridiculously long password that Data quotes to the computer in “Brothers”. But I had to google how to make hardboiled eggs a few days ago.

You must be fun on dates.

I get positive feedback every now and again.

So tell me what are the onboard fusion reactors for?

Well that does depend on the ship or station in question. Primarily they were used for the impulse engines which were essentially a bunch of fusion reactors strapped together and a nozzle to direct thrust. The power could be fed throughout the ship by directing it through EPS conduits. DS9 had fusion reactors left over from the Cardassians, if I remember correctly, that were used to power the overall station. If my memory is correct then those same fusion reactors could also be used in a self-destruct sequence on board DS9.