During the Oscar best picture announcement error, Warren Beatty and Faye Dunaway were given the wrong envelope; the moment they should have been discarding it and preparing the next one, the announcer (Cullinan) took a picture and tweeted instead, flooding his working memory and causing the error.

Tech companies have become expert in exploiting positive intermittent reinforcement—the same mechanism used by slot machines in casinos to keep people playing—where users scroll and get occasional hits of interesting content on an unpredictable schedule, keeping them glued to scrolling.

On the ancestral savanna, environmental change was minimal (primarily constellations and seasons); today, constant change everywhere bids for our attention, creating a radical mismatch between ancient sensory systems and modern stimuli.

If you need to give a morning presentation, go to bed and set an alarm for 5 a.m. to cram and review then, rather than staying up late cramming, because you will be refreshed from a full night's sleep with memory primed and tanks full, resulting in much better performance.

Attention spans have deteriorated due to a tyranny of attention—overwhelming demands from multiple directions that exceed our mental bandwidth capacity.

Scrolling and swiping on devices consume significant bandwidth because the brain's bandwidth is so narrow that most energy goes to maintaining physical cellular structure (pumping sodium and potassium ions across membranes), leaving very little for thought.

The brain and peripheral nervous system are fundamentally a change detector—they respond to any change in the current environment and are particularly sensitive to novelty.

Watching content on a screen is fine if you are focused only on that content, but if you are trying to do three or five things simultaneously, your focus is substantially degraded.

Pleasure is very short-lived (a point Aristotle made long ago), whereas the wanting and reward system is based on the hedonistic treadmill—as soon as you get something you want, you want something else.

The most effective way to reclaim attention would be to turn the phone off, but this is also the hardest thing for people because they have nomophobia (fear of being without their phone).

People have trained themselves like Pavlov's dogs to respond to phone notifications (the 'woosh' sound and screen light), creating conditioned anxiety when unable to check or hold their phone.

Yellow-tinted blue light blocking glasses are worthless for everyday use; to filter out enough blue wavelengths requires a dark orange lens so dark that you cannot see what you're doing, making them impractical for normal activities despite showing lab effectiveness.

Shortchanging yourself on sleep is functionally equivalent to having a blood alcohol concentration of 0.08 (legal intoxication threshold), causing significant suffering the next day.

When you get riled up and indignant over arguments, you're only hurting yourself, not others; this realization should motivate resilience in resisting engagement.

Zoom meetings with 20+ people on screen do not trigger oxytocin release and are very exhausting due to multiple factors: camera placement uncertainty, self-consciousness about appearance, and fragmented audio-visual streams that disrupt turn-taking signals.

Listening to one person speak consumes approximately half of working memory bandwidth; attempting to listen to two people simultaneously exceeds bandwidth capacity and becomes impossible.

The modern brain is no different from our distant Stone Age ancestors because evolution proceeds by accretion—once a solution is good enough, it persists and new features are added on, rather than replacing the old structure entirely.

Working memory is a mental scratchpad with severely limited capacity for holding information (such as a grocery list or access code), and everything the brain does costs energy in the form of ATP expenditure.

ATP (adenosine triphosphate) is the universal energy currency relied upon by creatures across the animal kingdom and is the bedrock of energy transformation in all living cells.

Taking a test requires significant mental energy expenditure, causing fatigue after 3-4 hours of testing despite no physical activity, because thinking itself consumes ATP.