Podbit · Stuff You Should Know
Blood is never blue — not even when deoxygenated. Veins appear blue because blue light can't penetrate as deeply as red light, so it reflects back to the surface. Red light goes deeper and gets absorbed, making deep tissue appear blue to the eye.
Where this was said
At 17:20 · chapter starts 16:00
Chuck and Josh tackle hemangiomas, the raised reddish 'strawberry marks' that alarm new parents but are usually benign. Only about 30% are visible at birth; most appear between 4–6 weeks and are gone by the time a child reaches double digits. Large ones near the eyes or ears can pose medical risks, and hemangiomas can extend internally to organs in rare cases. The discussion of why deeper hemangiomas look blue rather than red triggers a wonderfully entertaining detour: the hosts debunk the playground myth that deoxygenated blood is blue [1] — Josh Clark "Blood is never blue — not even when deoxygenated. Veins appear blue because blue light can't penetrate as deeply as red light, so it reflec…" 17:20 . Josh explains the actual physics — blue light reflects off shallow tissue while red light penetrates deeper and is absorbed — a fact Chuck swears he didn't know until that very morning.
Deoxygenated blood is not actually blue — veins appear blue because blue light cannot penetrate as deeply as red light, so blue light is reflected back to the eye.
In Dan Ariely's door experiment, participants sacrificed the highest-reward door — repeatedly — just to avoid seeing other doors disappear. Even when researchers trained them to use the best door, they kept wasting clicks to maintain options. This is the bias that runs our lives: we'll take a worse outcome to preserve the feeling of optionality.
Dan Gilbert discovered that the brain has a 'psychological immune system' — it misremembers, reframes, and rationalizes to keep you satisfied with whatever you chose. The fear before commitment is all about potential regret. But after committing, your brain quietly starts justifying the choice — and the more irreversible the decision, the stronger the effect.
The psychological immune system can get you through the first few months of any commitment. But durable, long-term well-being requires self-concordance — choosing commitments that are genuinely aligned with your values and what you actually want. Without that alignment, the satisfaction fades fast.
Vision didn't just help animals find food — it ignited the Cambrian explosion of speciation. Half of the human cortex is devoted to visual processing, and that same visual hierarchy directly inspired the neural network architectures powering today's AI.
Peptides come loaded with a powerful narrative: regenerative, subcutaneous, targeted, cutting-edge. That narrative can genuinely move outcomes, especially for pain, energy, and recovery. The RCT's job is to quantify how much additional benefit comes from the molecule itself — above and beyond the compelling story surrounding it.
A pharmaceutical is not an amino acid sequence — it is the successful solution to manufacturing, purification, formulation, and consistency challenges. When clinical trials prove a drug works, they validate a specific product under specific processes, not every preparation that shares the same sequence.
Ask one question of any peptide advocate: what evidence would prove this claim wrong? If every disappointing result gets attributed to wrong dose, bad supplier, wrong timing, or improper stacking, the hypothesis is not falsifiable — and a non-falsifiable claim is not a scientific claim.
When you vividly imagine something, your visual, auditory, and motor cortices light up almost identically to when it actually happens. This means daily visualization is genuine neural training — not wishful thinking.
Reality has gaps — and you fill them with stories. When you meet someone new and instantly form an impression, that's not perception, it's imagination. Recognizing this is the first step to changing the story.
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