Nobody knows, and it's mostly random based on news events, so why try to guess? (toolsformoney.com)
Once you reach your goal, continue to give praise for every correct response, but begin to provide the food reward on a more intermittent random basis. (tampabayvets.net)
We'll pick three winners completely at random based on community interaction, and you can get started by giving us a retweet below. (9to5google.com)