ScienceInsights

Plasma donation usually takes 1–2 hours, but your first visit runs longer. Here's what shapes your time from check-in to walking out the door.

Eggs contain mostly unsaturated fats concentrated in the yolk. Learn how size, cooking, and enriched varieties affect the fat content in your daily eggs.

Those numbers and abbreviations on your eye prescription actually tell a clear story. Here's what SPH, CYL, axis, and the rest really mean.

Becoming a registered dietitian takes a graduate degree, supervised hours, and a licensing exam. Here's how the process works and how long it takes.

Vaginal canal length varies more than most people realize. Here's what research says about average size, how arousal changes it, and what affects it.

Learn how to measure your pupillary distance at home using a ruler and mirror, and when to ask your eye doctor instead.

Smegma is a normal buildup that's easy to manage with gentle, regular cleaning. Learn how to safely clean and prevent it for all body types.

Creatine boosts muscle energy, strength, and recovery. Learn how it works, who benefits most, and whether it's safe for long-term use.

About 4 in 10 American adults are obese. Here's how that breaks down by age, race, income, location, and what it means for health and healthcare costs.

Learn what a D&C procedure involves, why it's performed, what recovery feels like, and what risks to be aware of.