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More than one-third of adult Americans are obese. Diseases that kill the largest number of people annually, such as heart disease, cancer, diabetes, stroke, and hypertension, can be attributed to diet.
There are more sensory neurons in the tongue than in any other part of the body.
The liver is the only organ that has the ability to regenerate itself after certain types of damage. As much as 25% of the liver can be removed, and it will still regenerate back to its original shape and size. However, the liver cannot regenerate after severe damage caused by alcohol.
Vaccines prevent between 2.5 and 4 million deaths every year.
There used to be a metric calendar, as well as metric clocks. The metric calendar, or "French Republican Calendar" divided the year into 12 months, but each month was divided into three 10-day weeks. Each day had 10 decimal hours. Each hour had 100 decimal minutes. Due to lack of popularity, the metric clocks and calendars were ended in 1795, three years after they had been first marketed.
![Much of the dark space between stars, as seen in the sky of the image above, is due to the human eye](https://biology-forums.com/gallery/47/medium_27605_22_04_12_6_16_47.jpeg)
![Because of the hazards of a vacuum, astronauts must wear a pressurized space suit while outside thei](https://biology-forums.com/gallery/47/medium_12359_17_05_12_12_46_44.jpeg)