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58
Could Apollo astronauts stand up if they fell on the moon?
space.stackexchange.com

36
Did Michael Collins ask for a fourth gimbal for Christmas? Is there a recording or transcript?
space.stackexchange.com

19
Tweetable Mathematics
mathoverflow.net

16
Which algebraic relations are possible between algebraic conjugates?
mathoverflow.net

16
Tweetable Mathematics
mathoverflow.net

16
Rational approximations of $\sqrt{2}$ in $\mathbb{R} \times \mathbb{Q}_7$
mathoverflow.net

16
Detailed radar imaging of Tiangong-1; how do they do that?
space.stackexchange.com

14
Examples of famous 'workhorse' theorems
mathoverflow.net

14
Does the Galois group of a Pisot polynomial contain the alternating group?
mathoverflow.net

14
Tweetable Mathematics
mathoverflow.net

14
In which cyclic cubic number fields does there exist this type of unit?
mathoverflow.net

13
Formic Functions - Ant Queen of the Hill Contest
codegolf.stackexchange.com

12
In a CM field, must all conjugates of an algebraic integer lying outside the unit circle lie outside the same?
mathoverflow.net

11
Have spacecraft photographed each other beyond Earth orbit?
space.stackexchange.com

9
Can a sum of roots of unity be an integer?
mathoverflow.net

8
Continued fraction expansion of an algebraic number and its conjugates
mathoverflow.net

8
Seeking very regular $\mathbb Q$-acyclic complexes
mathoverflow.net

7
Neighborhood fingerprint of a graph
mathoverflow.net

6
lattice in number field already a fractional ideal?
mathoverflow.net

6
A curious identity involving a covariant of binary cubic forms
mathoverflow.net

6
Building the ISS LVLH frame in ECEF/ITRF coordinates
space.stackexchange.com

5
unit group of biquadratic fields
mathoverflow.net

5
Units of an extension of $\mathbb{Z}$
mathoverflow.net

5
Prime factors of the members of a certain recurrence
mathoverflow.net