Opposites (Not Exactly Antonyms)

Instructions: I don't know how to explain it. Just read my mind to figure out what answers I'm looking for. The clues might help.
People probably don't read the instructions on quizzes like this anyway.
Quiz by ThirdParty
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Last updated: September 28, 2014
First submittedSeptember 28, 2014
Times taken152
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What it Isn't
What it Is
Mars
Venus
an orange
an apple
a lion
a tiger
tea
coffee
a nurse
a doctor
a tragedy
a comedy
geometry
algebra
a beard
a moustache
anorexia
bulimia
What it Isn't
What it Is
the color green
the color red
a cloudy day
a sunny day
a marathon
a sprint
an insect
an arachnid
pepper
salt
a coupé
a sedan
the Netherlands
Belgium
the number 7
the number 13
a Great Dane
a Chihuahua
What it Isn't
What it Is
a Macintosh computer
a Windows PC
the book of Exodus
the book of Genesis
John Adams
Thomas Jefferson
quantum mechanics
general relativity
Harry Potter
The Lord of the Rings
Germanic languages
Romance languages
the city of Aleppo
the city of Damascus
incandescent light bulbs
fluorescent lamps
Johannes Vermeer
Rembrandt van Rijn
+1
Level 83
Sep 28, 2014
Blue for red was what I thought as well. Until I tried a second time for what I missed. For Genesis I tried Matthew and the book of Revelation, I never guessed Exodus, though in some ways it's the "opposite", I see that now. Qu'ran would've worked for the Bible, but had to try it here too. For marathon I couldn't think of "sprint", tried 100m dash. Some are a bit strange to explain why I got them, but it just felt right to answer like I did. (also missed light bulbs and quantum mechanics)

Oh and by the way, I read the non-instructions.
+1
Level 49
Sep 28, 2014
"100m dash" will work now. ("100 yard dash" and "100 meter dash" already worked, but I'd forgotten to include the abbreviations.) I've also switched Exodus and Genesis so that there will be fewer other attractive answers.
+1
Level 49
Sep 28, 2014
By the way, the fact that some of the answers are hard to explain is why the instructions say "read my mind". I toyed with several different ways to structure the clues and the quiz instructions, and finally decided that was the most succinct and the most fun.
+1
Level 66
Sep 29, 2014
Is it a good thing or a bad thing that I can read your mind perfectly and got 100%?
+1
Level 74
Sep 30, 2014
These are the most hysterically funny instructions I've ever read! Fun quiz.
+1
Level 65
Oct 1, 2014
Maybe the title of the quiz should just be "Guess What I Am Thinking".
+1
Level 49
Oct 2, 2014
Well, I wanted it to be findable via the search field.
+1
Level 43
May 27, 2020
What is the opposite of a gun, my friend answered a knife, I was thinking magnet and also is the opposite of ice fire, water, or lava?