Why Is Samsung's AllShare Cast Dongle Less Known Or Less Preferred Compared with Google Chrome Cast,

Because it is not a content hub like the others mentioned, but a dongle to mirror your mobile screen over WiFi to a HDMI device like a TV.And even for that it initially only supported the Galaxy S4 as a a mobile device because of a bug in their implementation of the WiFi Miracast standard (the WiFi standard to mirror content of devices, which has been applied to several phones, many TVs and other devices as default feature from 2013 onwards).After Samsung fixed those bugs in a firmware update it supported also to mirror other mobile phones with Miracast, but ultimately it remained what it is: a dongle to add Miracast to TV's which do not support it on their own yet. Why is Samsung's AllShare Cast Dongle less known or less preferred compared with Google Chrome Cast, Apple TV, or Amazon Fire TV?

1. Why are these tv's pixelly?

Could be a variety of reasons... It could be problems in the feed they are sending to the TV. To send the same signal to lots of TVs and maintain quality you need amplifiers. Walmart may not make that investment. So the bad ones could just be getting feeds that had been spliced too much. It could be a viewing angle issue. Viewing angle impacts on the TV are not just horizontal, but also vertical. So you might have been at a better viewing angle on the ones that looked good and a worse angle on the ones that looked bad. You would need to see them all at the same eye level in order to determine if that is coming into play or not. All TVs are not the same, so it could be related to TV qualities. Were the ones that did not look so hot still good quality TVs? Or were they perhaps actually inferior sets in some ways? That could certainly be part of the issue. The ones at the bottom shelf could be good TVs or bad TVs. Unless you can be assured the playing field is level though, its hard to say 100% whether or not the issues you are seeing are TV quality or not.

2. Why do people keep argueing about global warming?

Listen young ones, if you really want to stop or slow down global warming, Look to the government to make the big money making companies, stop polluting, period. Plus we can do our part too, but, we are really governed by the big companies such as Big Pharma, and only a few more. Oh , oil companies. Sound familiar? Have you noticed the company that produces windex, etc, can not remember their name now, made a commercial on TV stating they are using the poop of cows which produces a gas called methane, i think, to run their machines. They are doing that to either try to make other big companies do the same or trying to save their a--! I am very frustrated at our government and the rich who say there is no global warming. Do not they care about their own children, themselves and our future children. I just do not get it. And it's all because of the almighty DOLLAR!.

3. Hook up my ps3 and home theatre system to my tv.?

Your HT, like almost all HTIBs (home theaters in a box) is seriously lacking connection options. First, the HDMI is probably HDMI out, so forget about connecting the PS3 to it. Second, hardly any TVs pass surround sound via optical cable. If your HT is like most HTs, this is your best setup: PS3 - Send the PS3 video directly to the TV via HDMI. Adjust PS3 video output settings accordingly. Send the PS3 audio to the HT via optical cable. Adjust settings accordingly. HT - send video out to TV via HDMI cable. TV - What is the source of your regular programming? Is it cable, antenna or satellite? If it's cable do you have a cable box? I ask because the only way you can get surround sound from cable is if you either connect it directly to the HT or if you have a box that allows you to split the audio and video signals (sending the video>TV via HDMI and audio> HT via optical and digital coax). If you have no box see if you can connect the cable directly to the HT. That way the audio goes to the HT and the video can be sent to the TV via HDMI out.