apple is trying to remain more domestic pettive. the android is taking hold of the market. the iphone only makes up about 3% of the broader market, so this is about competition, and with a cheaper, lighter iphone, a lot of people will go for that. >> don't go away or too far because we are going to put you through the valentine's day test to test your knowledge about what you know today. we want to have our viewers see how you do. play along in the next hour. we will give alison the new cnn challenge. are you up for it? >> i'm excited for it. can't wait. >> we will see if you are. well, on a serious note, warnings for parents. there's a new study that says energy drinks can be dangerous for kids because they can get too much caffeine. elizabeth cohen is here to give us a sense of what happens here.