Health refers to physical, mental, and social well-being. It’s a broad category that contains fitness and exercise, nutrition, health science, and mental health.
Crossing your eyes can’t make you permanently cross eyed; the muscles holding the eye will fatigue and the eye will return to it’s original position.
The term malaria comes from two medieval Italian words “mal” and “aria,” which when put together mean “bad air.” This came about before we understood that the disease was passed from a parasite carried by misquotes who lived in the wet ground, and not through “the bad air of swamps”.
Malaria would have needed to kill an average of about 5 ½ million a year to kill half of everyone ever, we don’t have data to prove this. However, we know almost half the world’s population is at risk of Malaria and it kills up to a million a year today.