Frederick Soddy, who won a Nobel prize for his study of isotopes, is better known for his research on circles and a poem he published in Nature in 1936.
The Kiss Precise by Frederick Soddy
For pairs of lips to kiss maybe
Involves no trigonometry.
‘Tis not so when four circles kiss
Each one the other three.
To bring this off the four must be
As three in one or one in three.
If one in three, beyond a doubt
Each gets three kisses from without.
If three in one, then is that one
Thrice kissed internally.