What is a good QR code scanner app that will work on both iPhone and Android?

I'm trying to put together a show for various vendors to come an show their products to interested customers. At the end of the day, we would like to have a list of which customers showed a great interest in each product. We were thinking a good way to find out if a customer was truly interested would be to put a QR code on their name tag, and the vendor could scan the QR code with their phone and the information about that customer's name and company would be downloaded into a list somewhere. We could then have the vendors email us the lists at the end of the show. Can anyone recommend an app that will do this?

Is my co-worker just joking around or is she really angry with me and being serious threatening me?

I work for a mostly landscape gardening firm. I was making some jokes about my co-worker behind her back. I'm quite shy, especially around women, but I knew the other 2 guys would find them really funny, so did it even though it was really crude. She is only young, 21, whereas I'm 26. She gets on well with the 2 other guys we're working with, probably better than I do, and they are both about 22.

I made some jokes about her and her husband (who I've never met) and some other stuff, only to realise she was right behind us, which, where I'm shy, made me really nervous. She went to whack me in the knee with her hoe. She pulled back at the last second, but she did it enough that I seriously thought she was going to and fell to the ground. She put the hoe down on my neck and was asking me what I had just said. I was only joking and said as much, and apologising, but she was still going as if to stab me in the neck. She told me to kiss her boot to apologise, or she was going to have the guys (who were now laughing at me) use her iPhone to film what was going on, and also she wouldn't let me up, so I did it, but she made me do it several more times before letting me up. She was barking orders at me all for the rest of the day & the same today.

The 2 guys today told me she was now telling them she was gonna report me for sexual harassment to get me sacked for what I said. Are they just joking too or not? I'm shy and not used to working with other people much, so I can't tell?

Added (1). Also, if she is actually angry at me what could I do to resolve the issue?

Which is the best iphone, used or new, for the price?

I'm looking into getting a new phone. I would like to have an iphone because I hate my android, what is the best version for the price? I use Verizon and I'm open to getting a used one. I don't need the hot new thing, just one that is dependable and will hold up through some time. I usually like to keep my phone for at least 2 or 3 years.

Can I retrieve photos from my iphone if it has no battery?

My battery has disconnected from my phone, when I plug my charger in the apple screen comes up and it stays like that. Is there anyway I can access my photos by using itunes?
Or, is there any other way to get to them i've lost 3 years of photos.
Any help is appreciated!

Iphone 4s won't connect to internet?

I can connect to the internet fine, but when i go to college and try to connect their it doesn't work. It connects but with the college qwifi you have to log in on their page that pops up when you connect but it won't pop up, since my college has a library in it when i connect to the tmc public it pops up like is should but with the tmc stu version (student version) it doesn't come up

Should I buy a Mac-Air or Microsoft based ultrabook?

I need a new laptop and debating between Apple based laptop such as Mac-Air, or Microsoft based laptop.

I want an ultrabook that is fairly light.

I've always used Microsoft computers except my phone is an iPhone and I have couple of iPads.

My only concern with Mac-Air is that some applications that I'm used to on Microsoft won't run on Apple computers.

Any advise?

I slept on my new Iphone 5s?

I did it twice already and it has only been the third day since I bought it. Will the screen break if I sleep on top of it? I'm scared because I think I might have pressed on the screen too hard or something. I didn't expect to sleep with it, I just did.

The phone is fine now and its working okay, but what could possibly happen if you sleep with you Iphone? Do you sleep with your iphone?