Men tend to have higher sex drives than women on average, but hormones, brain wiring, and age all shape desire in ways that vary widely between individuals.
Fertility odds shift more than most people realize as you age. Here's what the research says about monthly and cumulative conception rates by age group.
From lab tests to smartwatch estimates, here are the most practical ways to measure your VO2 max and what the number actually tells you about your fitness.
Most children with progeria live into their early teens. Learn how the condition affects the body, what shapes life expectancy, and how treatment helps.