Let's say you need to explain in more detail than "it's bad" why crossing the streams of the proton packs is bad, and it won't just fit into a couple of sentences because you really need the audience to understand exactly how it works. You could just have one character explain protonic reversal to another character, then when you realise "Oh no, this is just a page of technobabble talking heads!!" you add some nice illustrations of stream-crossing and protons in the background to make it TECHNICALLY not talking heads. Sometimes this is a good option!
But alternately, you could use this moment to also introduce some contrast between the characters. Perhaps one of them has always seen crossing the streams as a last resort -- yeah, obviously it's bad and usually you shouldn't do it, but maybe there's some situations where you have to close a portal or something, and knowing how exactly stream crossing works would be useful! The other character interrupts, adamant that that kind of thinking gets people killed -- no, crossing the streams is bad, it's always bad, under no circumstances should you do it and you CERTAINLY shouldn't teach our new team members how to do it. It's bad. Leave it at that.
In the second option, this scene is more than just exposition -- it is exposition about stream-crossing, but it's also Showing us something interesting about these characters and their attitudes towards life and problem-solving (and each other). In this version, it would actually probably be better to see the characters' faces, rather than an illustration of stream-crossing, so you can see their expressions and reactions to each other during the argument.
(this kind of thing can also be a great way to hide that you're expositing, which is nice for a mystery -- people can pick up on the world-building but don't feel like you're pointing a big flashing arrow saying THIS WILL BE KEY TO SOLVING THE MYSTERY LATER if the scene feels like it might be there more for character development reasons. )
I think if you have a story that has a lot of talking, the answer isn't always to hide the talking --sometimes it's better to make the talking parts dynamic and interesting and full of character. Situations where a character is hiding information can be incredibly tense. Situations where characters argue can be interesting or upsetting or funny. Even just a character yammering on and on about something can be played for laughs, or made into an endearing moment where a normally stoic character opens up about something they're genuinely interested in. Think about what else is (or could be!) happening in that moment other than just the exchange of scientific information!