|
|
About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.
When Gabriel Fahrenheit invented the first mercury thermometer, he called "zero degrees" the lowest temperature he was able to attain with a mixture of ice and salt. For the upper point of his scale, he used 96°, which he measured as normal human body temperature (we know it to be 98.6° today because of more accurate thermometers).
Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.
Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
To prove that stomach ulcers were caused by bacteria and not by stress, a researcher consumed an entire laboratory beaker full of bacterial culture. After this, he did indeed develop stomach ulcers, and won the Nobel Prize for his discovery.
![(a) The relative age ranges of different dating techniques depend upon the half-life of the system u](https://biology-forums.com/gallery/47/medium_274477_04_02_15_12_24_31_205741018.jpeg)
![Long bones develop from several bony centers--one for the shaft and at least one for each end. The e](https://biology-forums.com/gallery/47/medium_273688_23_02_15_8_21_19_208905.jpeg)