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
Discovery Channel on DISH Network. 1  DISH is proud to offer Discovery Channel with all of their Top TV Packages! Discovery Channel is one of the most widely distributed satellite & cable TV channels in the U.S. Discovery explores life's big questions and amazing phenomenon, in both the natural and man-made worlds!