Sounds like good research to me:
After meticulous research Professor Smith, whose professional interests include the theory of solids and fluid flows, found that the British Zari apple is the perfect bobber.
His mind-bogglingly complicated equation was D = 3 x (2 + T ^2) x M / (10 x T), where D is diameter, T is typical texture of an apple, and M is average mouth size.
via Zari is the perfect bobbing apple, UCL professor finds – Telegraph.