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Ally and Ben are university students. They are eating lunch together after class.
Ally: So, do you like my new bag?
Ben: Umm ... I don't know a lot about bags. It doesn't look like anything special to me.
Ally: It doesn't look special, but it is special.
Ben: Why?
Ally: Well, because I can charge my cell phone with this bag.
Ben: How do you do that? Do you use a battery in the bag?
Ally: No. It's easier than that. You have only to put your cell phone in this bag and walk outside with it.
Ben: Really? I don't believe it.
Ally: It's true. It's a solar bag. It has a flexible solar panel on its back.
Ben: Wow! That's really cool!
Ally: Yeah, it's really convenient. I've already charged my cell phone with this bag a few times.
Ben: What if it's a cloudy day?
Ally: No problem. The solar panel can create electricity even in cloudy weather.
Ben: That's great. So, if they can put a solar panel on a bag, couldn't they also put one on a shirt or a jacket?
Ally: I don't see why not. Wouldn't it be great to wear a shirt that can charge your cell phone?
Ben: Yes, it would!