>Why does Kindle NEED to know how long I've stayed on each page? It doesn't, but every page turn event has a time stamp. Using that info it's pretty easy to kn

>Why does Kindle NEED to know how long I've stayed on each page? It doesn't, but every page turn event has a time stamp. Using that info it's pretty easy to know how long someone has been on a page. >Why does a smart TV NEED to store hover events in a persistent DB? When the company is doing AB testing to decide on the optimal page layout this information is important.