aging
3 free lessons tagged aging across Science. Each one is a short sequence of focused steps with narration and a five-question quiz at the end — take them in any order, no signup required.
Longevity Drugs: Do Metformin and Rapamycin Work?
The frontier of longevity is the search for a pill that slows aging. Learn what the science actually shows for the leading candidates, rapamycin, metformin, senolytics, NAD boosters, and GLP-1 drugs, how each targets a hallmark of aging, why results in mice so often fail in humans, and how to tell genuine research from supplement marketing. Evidence-first, not medical advice.
Biological Age: Can You Measure and Reverse Aging?
Two people can be the same age in years but decades apart in how their bodies have aged. Learn how scientists measure biological age with epigenetic clocks that read your DNA, what these tests can and cannot tell you, whether aging can really be reversed, and why even our data on the world's longest-lived people, the Blue Zones, turns out to be shakier than the headlines suggest.
Why We Age: The Hallmarks of Aging
Aging is not vague wear and tear, it is a set of specific, measurable biological processes. Learn the crucial difference between lifespan and healthspan, then the twelve hallmarks of aging, the scientific framework of what actually goes wrong in the body over time, from telomere shortening and zombie cells to chronic inflammation, and why they form a connected web rather than a single cause.