Why don't we have two hearts?
96993
Why do we have two of some organs, but not all?
35772
Is it possible to duplicate eyes?
125846
Does the Rule of Two Serve any Actual Purpose?
45024
Does "a couple" always mean two?
35904
What does it mean for two objects to "touch"?
62367
Why can two (or more) electric field lines never cross?
109656
Why do tuning forks have two prongs?
50766
"Two are better than one" or "Two is better than one"?
3220
Why do I have to evaluate this twice?
4294
Can the Room of Requirement be Two Things at Once?
88637
Why can a particle decay into two photons but not one?
13049
"There is/are more than one". What's the difference?
93714
Why do we not have spin greater than 2?
117892
"Both" vs "both of them"
152264
Two 'maketitle's in article
124566
Is it wrong to use "All" when there are only two?
42336
The Line with two origins