Science & TechFact
Every cell holds two meters of thread.
Your genome has about 3.1 billion base pairs. Stretched out, the DNA of a single cell would run roughly two meters, packed into a nucleus only a few micrometers wide. It works by coiling around protein spools called histones. Only about one to two percent of the genome actually codes for proteins.
Useful: Packing helps decide which genes are active: tightly wound usually means silent.
Source: en.wikipedia.org