Did you know?
The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
Did you know?
About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
Did you know?
As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.
Did you know?
When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.
Did you know?
Acute bronchitis is an inflammation of the breathing tubes (bronchi), which causes increased mucus production and other changes. It is usually caused by bacteria or viruses, can be serious in people who have pulmonary or cardiac diseases, and can lead to pneumonia.
A possible scenario for human evolution
These species are all at risk of extinction.
Basic overview of energy and human life.
Horse-human interaction
Human Memorabilia in Space
Time Line of Human History From Upper Paleolithic Period to the Present