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The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).
Hyperthyroidism leads to an increased rate of metabolism and affects about 1% of women but only 0.1% of men. For most people, this increased metabolic rate causes the thyroid gland to become enlarged (known as a goiter).
The training of an anesthesiologist typically requires four years of college, 4 years of medical school, 1 year of internship, and 3 years of residency.
Congestive heart failure is a serious disorder that carries a reduced life expectancy. Heart failure is usually a chronic illness, and it may worsen with infection or other physical stressors.
Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
![Care must be taken in handling bodily fluids to prevent the transfer of infectious agents through co](https://biology-forums.com/gallery/47/medium_18099_24_09_12_10_41_39.jpeg)
![Before the advent of vaccinations and antibiotics, infectious diseases such as cholera were the scou](https://biology-forums.com/gallery/47/medium_273688_23_02_15_7_45_12_208641281.jpeg)