Over the last few weeks I have been reading small chunks of A Brief History of Time and initially felt that I had a grasp of the subject matter - no pun intended.
Having now tried to understand quarks, antiquarks and flip particles I am really struggling and about to go back a chapter to try again.
So, my question to the assembled intellect of STW is what page / topic did you get to when you realised you had lost the plot ?

