Can others see us many years ago relative to them?
99605
If you view the Earth from far enough away can you observe its past?
68546
Statistic for views over time
86188
Get attention to a new answer to an old question
42172
Determining user's reputation as of particular date?
61741
To tell the name of a person I met in the past
32913
Does a polymorphed creature remember who his friends are?
91471
Can other players see me on their map?
139007
Does everyone see the same Pokémon?
24300
View history of changes
98096
Group of $r$ people at least three people have the same birthday?
142852
Is "proven" very old -fashioned?
35126
How come the year doesn't show here?
109273
Extending the birthday paradox to more than 2 people
10559
Is it common to use "where" after "a time" as a relative?
87562
Reminding others of one’s favors for them
29649
Am I ready for a century?
100690
Does superluminal travel imply travelling back in time?