
The human body
The human body is incredible. 206 bones, 7 trillion nerves, and 60,000 miles of vessels – all running 24/7. Start with your vascular system: an estimated 60,000 miles (96,560 km) of arteries, veins, and capillaries snake through you right now. That’s enough to circle Earth more than twice. Your heart pumps blood through this entire network every minute of every day – delivering oxygen, nutrients, hormones, and carrying away waste. Then there’s your nervous system – a full-body electrical gri















