While much information can be gleaned by testing the blood itself (drawn from a vein by phlebotomy), it is sometimes necessary to examine the source of the blood cells in the bone marrow to obtain more information on hematopoiesis; this is the role of bone marrow aspiration and biopsy.
From Wikipedia, the free encyclopedia. The wheel bug (Arilus cristatus), in the family Reduviidae, is one of the largest terrestrial true bugs in North America, being up to 1.5 inches (38 mm) in length. A characteristic structure is the wheel-shaped pronotal armor.
The whiz-wheel (or circular slide rule) is a handraulicly operated flight computer which only works if you practice with it, you perform you SDT calcs, fuel consumption calcs, wind drift calcs etc on it...the benefits are it does not need batteries, does not break when dropped and will continue to function even when the yanks reactivate the selective availability on the GPS when DS # 2 kicks off in a few weeks time.