Normally, people produce about 100 billion white blood cells a day. ... However, an increase in the number of white blood cells is also caused by cancers of the bone marrow (such as leukemia) or by the release of immature or abnormal white blood cells from the bone marrow into the blood.
Overview of White Blood Cell Disorders - The Merck Manuals
https://www.merckmanuals.com/.../blood-disorders/white-blood-cell-disorders/overview-...
False the synovial membrane is a special conective tissue
https://en.wikipedia.org/wiki/Synovial_membrane
Tornadoes (i think) it is caused by 2 cold frounts colliding