Brain Pickings is the opposite of fluff, but it’s not all serious and it’s not nose in the air pomposity. It’s
“a human-powered discovery engine for interestingness, a subjective lens on what matters in the world and why, bringing you things you didn’t know you were interested in — until you are It’s not always serious stuff. But it’s always food for thought.”
On a more literal ‘brain wave’ is David DiSalvo’s the Daily Brain is about the brain and how it works, according to DiSalvo it’s
“knowledge for hungry brains, … for people who love asking questions and searching for answers – especially when the answers lead to new questions.”
Check ‘em out.