|
Author Question: In most situations, the true mean and standard deviation are unknown quantities that have to be ... (Read 136 times) |
The familiar sounds of your heart are made by the heart's valves as they open and close.
Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).
Warfarin was developed as a consequence of the study of a strange bleeding disorder that suddenly occurred in cattle on the northern prairies of the United States in the early 1900s.
On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
The human body produces and destroys 15 million blood cells every second.