The Cricketer Tea Break Crossword
Crosswords3 mins ago
No best answer has yet been selected by ccyy1993. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.Technically the weak and electromagnetic were shown to be aspects of the same force (much as electricity and magnetism were) some years ago.
That means it's 3 or 4 depending on how you ask the question.
It is widely believe that the strong force can also be accounted for in the same way but that has not yet been achieved.
That leaves Gravity as the joker in the pack - Unifying all the forces, showing them to all be different aspects of a single force is one of physics' holy grails. So if you fancy shaking the king of Sweden's hand and picking up a Nobel that's what you want to be doing!