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More in Biology
How to Fix Your Microbiome: What Actually Works
Fiber, fermented foods, and movement can restore gut health, but probiotics aren’t always the answer. Here’s what the science actually supports.
How Is Lymph Formed: From Capillaries to Vessels
Lymph forms when fluid leaks out of blood capillaries and gets collected by the lymphatic system. Here’s how that process actually works.
What Is Lymph Made Of: Proteins, Cells, and Fats
Lymph is more than just fluid — it carries proteins, immune cells, dietary fats, and clotting factors, with its mix varying throughout the body.
How Much Water Is in Your Body by Age and Body Type
Your body water percentage shifts with age, sex, and body composition. Learn what’s typical for you and how to stay properly hydrated.
What Are the Lymphatic Organs and Their Functions?
Learn how your lymphatic organs — from the thymus and bone marrow to the spleen and lymph nodes — keep your immune system running smoothly.
What Does Blood Contain? Cells, Plasma, and More
Blood is more than just a red liquid. Learn about plasma, cells, platelets, and minerals that keep your body running.
What Are Facial Expressions and How Do They Work?
Facial expressions are shaped by muscles, evolution, and culture. Learn how they work, when they develop, and what science reveals about the emotions behind them.
How to Regrow Hair, Bone, Muscle, and More
Your body is constantly rebuilding itself. Here’s how hair, bone, muscle, and other tissues actually regrow—and which ones struggle to heal.
How to Feel Younger: What Science Actually Says
Science shows your biological age is largely within your control. Here’s what actually works to feel and function younger, from muscle to sleep to social connection.
Is Blood Dirty? What Science Actually Says
Blood gets called “dirty” a lot, but science tells a different story. Here’s what blood actually contains and when it can genuinely pose a risk.
What Is TREM? The Immune Receptors Linked to Alzheimer’s
TREM receptors help regulate immune responses in the brain. Here’s what scientists have learned about their role in Alzheimer’s disease and beyond.
How Much Mucus Is in the Human Body, Really?
Your body produces far more mucus than you’d expect, and most of it quietly keeps you healthy every day.
What Is the Average Height for an Adult Male?
The average American man stands 5’9″, but height varies worldwide. Learn what drives these differences, from genetics to nutrition and environment.
What Percentage of Your Body Is Made of Water?
Your body is mostly water, but the exact amount depends on your age, sex, and body composition. Here’s what’s normal and why it matters.