Research timelines
Science progresses.
For each of these subjects, we show how the understanding has developed over decades — because the goal is not to present knowledge as fixed, but to help you read the current evidence in its historical context.
How our understanding of olive oil evolved
Olive oil is one of the most-studied fats in modern nutrition. Its story is a good example of how evidence deepens over decades.
7 milestones
How our understanding of walking evolved
Walking is one of the most-studied interventions in modern medicine. Here is how the recommendation matured.
6 milestones
How our understanding of sleep evolved
Sleep science has moved beyond total-hours advice into timing, consistency, and daylight exposure.
5 milestones