What it turns out is that we think we're multitasking, but we're not. The brain is sequential tasking: we flit from one thought to the next very, very rapidly, giving us the illusion that what we're doing is doing all these things at once.

Of the thousands of ways that humans differ from one another, turns out there's this one cluster of traits called conscientiousness that predict a whole host of positive life outcomes, such as longevity over our health, life satisfaction.

Our brains are very, very good at self-delusion. What happens is, it releases the stress hormone cortisol in the brain, which leads to foggy thinking, so you're not even able to judge well whether you're working well or not.

Daniel Levitin Quotes