SPF stands for Sun Protection Factor. Sun Protection Factor is not a measure of the time that someone spends in the sun, instead it is a measurement of solar energy (according to the FDA). Protection against this sun energy is the primary purpose of most sunscreens. Using the FDA’s website and other sites, including Wikipedia, the goal of this article is to better explain what SPF is. SPF ranges from 2 to 60 (according to this site: How to Understand SPF Numbers | HealthGuidance.org), however we at Peeq have seen and used SPF 100. The key to the numbers is that they represent a logarithmic scale, not a linear one. That means that an SPF 2 prevents the absorption of...