bridget carrie says lots of apps can eat up battery life on any smartphone i don't they are not supposed to be doing that. >> reporter: snapchat constantly pulls your gps location and sends notification. for best advice, go into settings and turn off the background app refresh for your apps. i looked on my phone. all of them were on. and it turns out simply closing an app when you are doing using it may eat up more battery than it saves. >> when you start it up again it has to redownload and repull in all the memory. >> reporter: jack and sarah say they are on their phones all day. >> facebook, instagram. >> reporter: but they are still not ready to leave their chargers at home. jill wagner, cbs news, new york. >>> all eyes on wall street today. despite the attacks of paris on friday the market is actually up, and up in a big way. you see it there up nearly 200 points at this hour. >>> medal of honor recipient captain rowberg rang the new york stock exchange bell. >>> combating obesity one step at a time. how a regine regime is paying off in the classroom. we'll be right back. now and th

coming up next, the new warning about an ingredient that you may be carrying in your >>> bridget moynahanming up. she is bringing a book. we will be right back. ed when my doctor told me i may reach my blood sugar and a1c goals by activating what's within me. with once-weekly trulicity. trulicity is not insulin. it helps activate my body to do what it's supposed to do release its own insulin. trulicity responds when my blood sugar rises. i take it once a week, and it works 24/7. it comes in an easy-to-use pen and i may even lose a little weight. trulicity is a once-weekly injectable prescription medicine to improve blood sugar in adults with type 2 diabetes. it should be used along with diet and exercise. trulicity is not recommended as the first medicine to treat diabetes and should not be used by people with severe stomach or intestinal problems, or people with type i diabetes or diabetic ketoacidosis. trulicity is not insulin and has not been studied with long-acting insulin. do not take trulicity if you or anyone in your family has had medullary thyroid cancer or multiple endocrine ne

carry the phone soon. that's it for this tech news update, and there's more at cnet.com. from our studios in new york, i'm bridget carey. 3 3 3 3 bridget carey. 3 3 york, i'm studios in new york, i'm 3 3 3 we'll take a look at your news and weather to go coming up after the break...you're watching siouxland news at 3 it's now (time) as we take a look outside (xxx) on the (xxx) cam. 3 3 here's a look at your weather to go ... 3 3 3 here's a look at your news to go ... 3 3 the top eight republican presidential contenders take the stage tonight in milwaukee for their fourth debate. this one... hosted by the fox business network and the wall street journal... is the second to focus on economic issues. donald trump and ben carson... who are essentially tied in the crowded race... will take center stage once again.miami international airport has resumed operations after a security situation monday night that delayed dozens of flights and sent the airport into lockdown. f - b - i officials say the incident was started after a passenger went through security with what was believed to be suspicious items in his carry - on