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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
If you use artificial sweeteners, such as cyclamates, your eyes may be more sensitive to light. Other factors that will make your eyes more sensitive to light include use of antibiotics, oral contraceptives, hypertension medications, diuretics, and antidiabetic medications.
The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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.