BJBjorken

Theoretical physics is a socially acceptable form of mental illness.

Since retirement my research interests have broadened into other fields such as geology. I have found that educating oneself in science off the internet is incredibly effective and efficient. I use wikipedia and online material provided by the teaching community from the community college level all the way up to the open source lecture material provided by MIT or other major institutions. That alone provides plenty of inspiration.

Entanglement.

Ignorance is bliss.

The big bang should be divided into inflation followed by what I call the 'hot big bang'. I think there is good evidence that there was a prehistory before inflation began. But nobody has a convincing version so far of that prehistory.