Yahoo25 lá
The evolution of bike helmets: From plant rinds to high-tech materials
Then, in the 1970s, a nonprofit dedicated to testing motorcycle helmets called the Snell Foundation released new standards for bike helmets. They set their standards so high that only lightweight ...
The Conversation25 lá
From using plant rinds to high-tech materials, bike helmets have improved significantly over the past 2 centuries
Then, in the 1970s, a nonprofit dedicated to testing motorcycle helmets called the Snell Foundation released new standards for bike helmets. They set their standards so high that only lightweight ...