Tattoos are something that used to be limited in popularity, but today more than 1/3 of people age 18-40 have them, according to recent surveys. Clark thinks that companies that develop tattoo-removal technology might just be good investments going forward! However, visible tattoos can hurt you in many workplaces, or keep you from getting the good job you want. So if you're thinking about getting a tattoo, consider keeping it in a place most people won't notice. It's just Clark's opinion, but he thinks it's a practical suggestion.