Podbit · Stuff You Should Know
Birthmarks fall into two broad families: vascular (caused by clusters of blood vessels near the skin) and pigmented (caused by concentrations of melanin). Neither type is fully understood by science, but understanding the difference determines how doctors monitor and treat them.
Shane and two neighbors are competing to burn the most calories in June. He's on pace for 35,000 and has had zero rest days in 30 days. He monitors neighbors' workout alerts like enemy dispatches and worries daily about dying in the pool.
A nurse practitioner earning $145K/year owes $120K in student loans, $17K on an upside-down car, and $6K in credit cards. The move: hold $5,500 for the car swap, attack the credit cards hard, and pull the trigger on the car trade when the math works.
Preparation absorbs anxiety. Imagining one friend in the front row keeps you grounded. Jet lag is a hidden panic trigger — get there a day early. Morning workouts and sunlight help. Beta blockers are an option. Even a beer has worked in a pinch.
Visual processing speed training — where flashed images must be remembered in decreasing millisecond windows — with booster sessions at years 1 and 3 significantly reduced dementia risk 20 years later. This is one of the strongest long-term cognitive training results ever published.
Meta-analyses of interventions in older adults show that ballroom and line dancing produce the greatest improvements in cognitive function. Unlike digital brain training, dancing combines motor skill acquisition, social interaction, musical timing, and physical exercise — hitting multiple neural networks simultaneously.
Aerobic exercise primarily benefits hippocampal gray matter and memory through BDNF and lactate. Resistance training primarily strengthens white matter and executive function through IGF-1. These are complementary, not interchangeable — you need both.
A study of older adults compared low-intensity exercise, zone 2 cardio, and the Norwegian 4x4 HIIT protocol. HIIT produced far superior hippocampal improvements — and those benefits persisted 5 years after the 6-month intervention ended. More cortisol released meant better outcomes.
Natural experiments in Wales, Australia, and Canada — where eligibility switched based on birth date — consistently showed lower dementia rates among shingles vaccine recipients. The newer Shingrix vaccine appears more protective than the older Zostavax. The leading hypothesis is an immunomodulatory effect that may also suppress other neurotropic herpesviruses.
The Adult Changes in Thought study and the Rush Memory and Aging Project both showed that cognitive decline is not smooth — it drops in steps after major illnesses, with hospitalizations causing the largest drops. Minimizing severe illness is a genuine brain-preservation strategy.
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