My most highly cited paper is on what is now called f of r gravity. It's a modification of general elativity that could possibly make the universe celerate. But it doesn't work for rotation curves of galaxies. So in my mind, it was a failure. And so i didn't write it bause it didn't do what i wanted to do. A other papers i had are very much like that. Ah, there's millions of ideas, probably, that i've had that have just failed and continued to fail. Like have not grown into great papers, but i tend to just not remember them very well., he says.