Snapshot · The Diary Of A CEO with Steven Bartlett
Magpies and parrots have a higher brain-to-body-mass ratio than humans — a fact that was quietly omitted when schools taught that humans top that list among mammals only.
Where this was said
At 50:50 · chapter starts 48:19
Tyson unpacks what 'intelligent life' actually means in a cosmic context, and the answer is uncomfortably complicated. [1] — Neil deGrasse Tyson "Humans are 4th in brain size among animals: By absolute brain mass, humans rank fourth among Earth's animals — behind whales, dolphins, and…" 49:54 By absolute brain mass, humans are fourth. By brain-to-body ratio, we top the mammal list — but not the bird list, with magpies and parrots exceeding us. Whales aren't building telescopes, but they might be considered intelligent by alien standards. Technology adds yet another layer: the Roman Empire had no electricity, computers, or radio receivers, so any alien signal sent to Earth 2,000 years ago would have gone entirely undetected — and they certainly weren't building spaceships. So 'intelligent life that can communicate across space' and 'intelligent life that has civilisation' are much narrower categories than 'intelligent life' alone. The operational definition matters enormously when asking whether we've been contacted or contacted others.
By raw brain mass, humans rank fourth on Earth behind whales, dolphins, and elephants. We invented the brain-to-body-mass ratio specifically to put ourselves at the top — but that only works among mammals. Mid-sized birds like magpies and parrots beat us on that metric too.
By absolute brain mass, humans rank fourth among Earth's animals — behind whales, dolphins, and elephants — meaning aliens prioritizing brain size might talk to whales first.
The widely cited ego-depletion model — the idea that willpower is a finite resource that gets depleted — failed to replicate in follow-up studies.
Humans are estimated to have 5,000–7,000 thoughts per day, yet can recall essentially none of them afterward, highlighting why in-the-moment emotional tracking matters.
A large Harvard study found that a wandering mind is an unhappy mind — people report greater happiness when their attention is tethered to the present, even if the task is unpleasant.
A key study finding that we have a 'credit card's worth of plastic' in our bodies was likely skewed because researchers used nitrile gloves that shed plastic particles onto the microplastic detector.
Emotionally sensitive people have a hyperactive amygdala, an underactive prefrontal cortex, and a frayed connection between the two — making emotional regulation structurally harder.
Rejection sensitivity can be observed as early as age 2 or 3, suggesting it has strong developmental and likely genetic roots.
A Yale study found that non-judgmental observation of emotions — without rushing to resolve them — reduces activation in the brain, making it a powerful regulation tool.
Dan Gilbert's research found that the psychological immune system — the brain's ability to justify and find satisfaction in choices — activates most powerfully when a decision is perceived as irreversible.
Barry Schwartz's research found that maximizers — people who try to optimize every decision — tend to achieve objectively better outcomes but report lower happiness than satisficers who choose 'good enough.'
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