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 the United Kingdom, Discovery Channel UK airs some common programs as the U.S. version, including MythBusters, American Chopper, How It's Made and Deadliest Catch. The channel is carried as a basic subscription channel on the SKYdigital satellite service and digital cable provider Virgin Media.