Scale Context
A nanometer is one billionth of a meter. Human hair is roughly 80,000 nanometers wide.
Applications
Sunscreen nanoparticles, stain-resistant fabrics, targeted drug delivery, and faster computer chips.
Medical Frontier
Nanoparticles can deliver chemotherapy directly to tumors, sparing healthy tissue.
Safety Questions
Particle size affects toxicity. Regulation lags behind rapid commercial deployment.