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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.

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According to the Migraine Research Foundation, migraines are the third most prevalent illness in the world. Women are most affected (18%), followed by children of both sexes (10%), and men (6%).

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To maintain good kidney function, you should drink at least 3 quarts of water daily. Water dilutes urine and helps prevent concentrations of salts and minerals that can lead to kidney stone formation. Chronic dehydration is a major contributor to the development of kidney stones.

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The most common childhood diseases include croup, chickenpox, ear infections, flu, pneumonia, ringworm, respiratory syncytial virus, scabies, head lice, and asthma.

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HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.

A petrified log in Petrified Forest National Park. A petrified log in Petrified Forest National Park.
A lace monitor (Varanus varius) in Byfield National Park A lace monitor (Varanus varius) in Byfield National Park
Spotted hyenas greeting one another in Kruger National Park Spotted hyenas greeting one another in Kruger National Park
A Royal Bengal Tiger, the largest big cat in Bannerghatta National Park, India A Royal Bengal Tiger, the largest big cat in Bannerghatta National Park, India
Rusty-tipped Page (Siproeta epaphus), Butterfly World (Florida) Rusty-tipped Page (Siproeta epaphus), Butterfly World (Florida)
A female parent with ducklings in Richmond Park, London, England A female parent with ducklings in Richmond Park, London, England
Video: Digestive System Animation

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