What’s In My Jar, a London-based start-up focusing on personalized skin care advice, has launched a free Sunscreen Finder tool, billed as a chat-based automated assistant that provides sunscreen recommendations based on a person’s skin type, lifestyle and budget.    The start-up contends there are more than 650 sunscreens in its database, and the tool evaluates the sunscreens formulas for the ability to provide stable, broad spectrum sun protection and assesses the risk of skin and eye irritat...