High Five Facts - Nails

The video provides five unique facts about nails, covering their composition, growth patterns, and protective functions. It explains that nails are made of dead cells, which is why cutting them is painless. The video also discusses the growth rates of fingernails and toenails, influenced by factors like hand dominance, gender, and vitamin D intake. It highlights the role of keratin in nails and their protective function against external injuries and bacteria. Additionally, the video delves into the history of nail polishing, tracing its origins to ancient China and its evolution over time.

What is keratin and where is it found?

What historical significance does nail polishing have, and what ingredients were used in ancient times?