"When the eye has imperfect sight the mind not only distorts what the eye sees, but it imagines that it sees things th…"

"At first the amoebae look like muscae volitantes, those curled moving spots you seem to see in your eyes when you sta…"

"Oh, squiggly line in my eye fluid. I see you there lurking on the periphery of my vision. But when I try to look at y…"

"They could have done the same thing, alone, in the back yard, seeing the shapes swimming in the sky. I forget how old…"

"The ' measures the volume of s compared to the total (red blood cells and ). The normal hematocrit for men is 40 to 5…"

"is the packed spun volume of whole that is made up of s and is expressed as a percentage of total . It can be measure…"

"A leaflet drops through your letter box advising on ways to avoid contracting and spreading . Your bag is searched as…"

"The secure and continuous production of and are key to U.S. national security. The introduction of foreign-origin or …"

"In a strict sense, biosecurity involves issues dealing directly with s and s, such as prevention of emergence, loss, …"

"When most physicians are asked about the realm of biosecurity, they often are able to discuss the subject in broad st…"