So, here's the update (names at the end are the folks that solved the clues):
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1. in much ado, calculus lives = Doc Al [hidden clue: adocalculus] rewebster
2. mini rod, twisted = moridin [anagram of "mini rod"] rewebster
3. mashed up w/ mashing tooth = wolram [mashing tooth = molar; w + molar --> wolram, after some jumbling] turbo
4. only country with map on flag loses its pee = cyrus [cyprus - p] turbo
5. best we err funnily = rewebster [anagram of "best we err"] MIH
6. bad turk with half a grand = kurdt [half a grand = 500 = D (Roman numerals), d + turk --> after rearranging] George
7. \sqrt{adj^2+opp^2}~@~Iowa = hypatia [hyp (from Pythagoras' theorem) + at + IA] kurdt
8. gloomy, without a right = moose [right = R, gloomy = morose; morose - r -> moose] neutrino
9. strange lover loses all resistance...and inductance = evo [lover - r (resistance) - l (inductance)] Astro
10. She's him? But that's completely backwards! = MIH ["him" backwards] rewebster
11. strangely, he's Mr. T, shortly, that is, etcetera = chemisttree ["that is" = i.e., "etcetera" = etc, he's mr t + ie + etc -> chemisttree after reworking] rewebster
12. derrick lacks that which could make it human = dick [to err is human, derrick - err -> dick] solved by George
13. bone marrow loses war but wins a skirmish = moonbear [bonemarrow - war + a -> moonbear after jumbling] neutrino
14. use me in HAL; then reformat = enumaelish [anagram of "use me in hal"] neutrino
15. Indian essence hydrates, they say = russ watters [russ ~ ras = essence in sanskrit, hydrates -> waters ~ watters] rewebster
16. hid a vector within = DaveC [hidden clue: hidavector] solved by neutrino
17. Cheerleading slogan for the King of Blues is messed up = BobG [King of Blues = B. B. King, anagram of "Go, BB"] turbo
18. found in Decatur, Boise and Maine =turbo [hidden clue: decaturboise; also turbo-1 lives in Maine] rewebster
19. Huxley does a Brother Gibb swap, we hear = gravenewworld [Brother Gibb = B G, Aldous Huxley's book Brave New World with B swapped for G] BobG
20. la salle de lierre, and many more = HallsofIvy [straight translation, I hope] turbo
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That leaves only 18, which is pretty difficult and requires esoteric knowledge of Sanskrit. From this point on, feel free to make up your own clues and post them for others to solve. If doing so, make sure you number them correctly so as to make referencing and compiling less messy.