Things you've believed for a long time were true, but are false in reality
105303
'Obvious' theorems that are actually false
91265
Has the speed of light changed over time?
95851
Validity of an argument with a contradictory conclusion
127642
Is "incorrect facts" a contradiction in terms?
63144
name this fallacy: A was P in the past -> A must be P now
79131
List of generally believed conjectures which cannot all be true
68265
Why is it sensical for a proposition with a false antecedent to validate to true?
153477
Present Perfect Usage of "Think" for Recent Past
56325
If we accept a false statement, can we prove anything?
57280
Unintentional Lies and Misinformation
154584
A while ago and a few minutes ago
128541
Something that is impossible but has happened
93683
Using Past Simple (verb to be) for Unreal (Counterfactual) Past Situations
62912
Behave as if it was or it were
130124
Is it possible to learn about an event that occurred outside of your observable universe?
88188
Explain proof by contradiction.
23177
Tense change: previous actions on something that's currently true