I find quantum physics very difficult to hold in my head. I can understand it while it's being explained, and sometimes for a day or two longer, but then it fizzles away (I find calculus to be of similar character). However, the essentials I've grasped have always come embedded in stories -- first in Greg Egan's magnificent debut novel Quarantine and now in How to Teach Physics to Your Dog. The going isn't always smooth or easy, but for me, it has never been less hard!
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.