https://twitter.com/royalsociety/status/1125852839270653952?ref_src=twsrc%5Etfw%7Ctwcamp%5Eembeddedtimeline%7Ctwterm%5Eprofile%3Aroyalsociety%7Ctwcon%5Etimelinechrome&ref_url=https%3A%2F%2Froyalsociety.org%2F

https://en.wikipedia.org/wiki/Three-body_problem

https://en.wikipedia.org/wiki/Symmetry_of_second_derivatives

and what else?...off on a tangent....a hop, skip and a jump through the following...to the 'symmetry of second derivatives'...as used by 'divine' chapman to signify 'copybot wurld'....LOL...is that what you were also looking for, dazzlenation?....go figure:

https://mary2point5.tumblr.com/

https://en.wikipedia.org/wiki/Three-body_problem#/media/File:Restricted_Three-Body_Problem_-_Energy_Potential_Analysis.png