Interest
Proportion of Hacker News items mentioning "helmet" over time.
Mentions
Total number of Hacker News items mentioning "helmet" over time.
A helmet is a form of protective gear worn to protect the head. More specifically, a helmet complements the skull in protecting the human brain. Ceremonial or symbolic helmets without protective function are sometimes worn. Soldiers wear combat helmets, often made from Kevlar or other lightweight synthetic fibers. Read more on Wikipedia