Google Trends is a popular tool for all manner of curiousity related to trends in search activity on the Google search engine: what topics are trending? what are trends for a given search term? how does this compare to other terms? what related terms are people using? how does interest vary by region? And lots more. Google Trends has recently passed its 15th birthday, prompting a Google blog post on “15 Tips for Getting the Most Out of Google Trends”.