Answer this question: who sang what a wonderful world?
Ans: It was first recorded by Louis Armstrong and released as a single in 1967.

Answer this question: what is impingement of the shoulder?
Ans: Shoulder impingement syndrome, also called painful arc syndrome, supraspinatus syndrome, swimmer's shoulder, and thrower's shoulder, is a clinical syndrome which occurs when the tendons of the rotator cuff muscles become irritated and inflamed as they pass through the subacromial space, the passage beneath the acromion .

Answer this question: where are the internal and external iliac arteries?
Ans: The external iliac arteries are two major arteries which bifurcate off the common iliac arteries anterior to the sacroiliac joint of the pelvis.

Answer this question: What is Ischemia or infarction??

Ans: In medicine , ischemia, also spelled as ischaemia or ischæmia, (; from Greek language ισχαιμία, ischaimía; isch- root denoting a restriction or thinning or to make or grow thin/lean, haema blood ) is a restriction in blood supply to tissues , causing a shortage of oxygen and glucose needed for cellular metabolism (to keep tissue alive).