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"I love that computer science has made mathematics into something like an experimental science. I was never all that good at proving things, but I love doing computer experiments."
- Rudy Rucker

Rachag  
  A caffeine-style stimulant.  

Halleck led the file of men into the room, the staff officers looking grimly serious followed by the younger aides and specialists, an air of eagerness among them. Brief scuffing sounds echoed around the room as the men took seats. A faint smell of rachag stimulant wafted down the table.

"There's coffee for those who want it," the Duke said.

Technovelgy from Dune, by Frank Herbert.
Published by Putnam in 1965
Additional resources -

Rachag is defined in Frank Herbert's Dune glossary as "a caffeine-type stimulant from the yellow berries of akarso" which is "a plant native to Sikun (of 70 Ophiuchi A) characterized by almost oblong leaves. Its green and white stripes indicate the constant multiple condition of parallel active and dormant chlorophyll regions."

Compare to the anti-fatigue pill from The Silent Destroyer (1929) by Henri Dahl Juve.

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Additional resources:
  More Ideas and Technology from Dune
  More Ideas and Technology by Frank Herbert
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  Tech news articles related to works by Frank Herbert

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