Here's why:
* Average hair growth: The average human hair grows about 0.5 inches per month.
* Maximum length: Even with optimal hair care and genetics, the maximum length a human can achieve is about 6-7 feet.
* Hair breakage: As hair gets longer, it becomes more fragile and prone to breakage. It's difficult to maintain such extreme length without significant damage.
* Weight and strain: 70 feet of hair would be incredibly heavy and place tremendous strain on the scalp and hair follicles, likely causing hair loss.
While some mythical stories and folklore involve people with impossibly long hair, it's not scientifically possible for humans to achieve such lengths in real life.