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Someone's going to make this comment when time travel is invented.

Oh, it has been invented already. I specifically came back in time to make the above comment...

We’re all living in John Titor’s world.

Our current understanding it that you can only travel forward in time. Could you explain how to do it backward?

I recall in one of the Asimovs Foundation books there was a fungus like substance that forced the crew to fly close to a star to kill it off.

That doesn't sound like Foundation to me. Are you sure it was from that series?

Yes, it was. Not the original series though. It's in Foundation and Earth: https://en.wikipedia.org/wiki/Foundation_and_Earth#Part_V:_M...

Oh, wow I totally forgot all about those sequels. Might have to re-visit them.

That is why we are warm blooded, we operate too hot for fungi to thrive.

Space Brie: Our Most Delicious Enemy