Right now, tiny cells inside you are dissolving your skeleton with acid, and that is exactly how it should be. Roughly 10% of the adult skeleton is broken down and rebuilt every year, so most of the skeleton you had ten years ago has already been replaced. This animated explainer shows who does the demolition, who rebuilds, and why your bones never stop renovating.

Chapters:

0:00 Intro

0:23 Bone Is Alive

1:23 The Demolition Crew

2:14 The Builders

3:13 The Ten-Year Cycle

4:12 Not All Bone Is Equal

5:13 Why Rebuild?

6:26 Bones Follow the Load

7:21 Bones in Space

8:31 Your Bone Bank

9:38 Look at Your Hand

• Meet the crews: osteoclasts that dig, osteoblasts that build, and osteocytes that sense every squeeze and bend

• Why spongy bone renews far faster than compact bone, and why 'every 10 years' is only an average

• Bones in space: what long missions do to astronaut bones, and why gravity is free exercise

• Peak bone mass around age 30, and the simple basics: load, calcium, vitamin D, and your doctor

• Real sources cited on screen (U.S. Surgeon General 2004, Bonewald 2011, Parfitt 1994, Manolagas 2000, Jones et al. 1977, NASA, Gabel et al. 2022); educational only, not medical advice

• English AI voiceover, original synthesized music and SFX, mixed to -14 LUFS

• Original vector animation in a neon, flat style; fact-checked

A friendly, fast-paced look at the hidden science of your body.