Rheumatoid arthritis - Causes. Rheumatoid arthritis is an autoimmune condition, which means it's caused by the immune system attacking healthy body tissue. However, it's not yet known what triggers this. Your immune system normally makes antibodies that attack bacteria and viruses, helping to fight infection.
Trying to find out what channel Discovery is on DirecTV? Well you are in luck! It can be found on channel #278 on the DirecTV Channel Guide. Discovery is also available in HD (High Definition). The great thing is that this particular channel is available in all of the Direct TV packages like Entertainment, Choice, Choice Extra, Choice Ultimate and Premier
In Italy, the Discovery Channel (and HD) is distributed via satellite by Sky Italia as part of the documentary pack. In addition, Italy has four Discovery-branded channels: Discovery Science, Discovery Real Time, Discovery Animal Planet and Discovery Travel and Living.