medicinal leech

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Red blood cells in vein, circulatory system

What Was the Science Behind Medical Bloodletting?

Lateral view of an adult bedbug, Cimex lectularius, as it was in the process of ingesting a blood meal from the arm of a voluntary human host. Photo dated 2006.

8 Animals That Suck (Blood)

Discover

Abstract vector hi speed internet technology background

History of Technology Timeline

United States Electoral College votes by state

How Many Electoral College Votes Does Each U.S. State Have?

The Battle of New Orleans, by E. Percy Moran, c. 1910. Andrew Jackson, War of 1812.

26 Decade-Defining Events in U.S. History

Leonardo da Vinci (1452-1519), Italian Renaissance painter from Florence. Engraving by Cosomo Colombini (d. 1812) after a Leonardo self portrait. Ca. 1500.

10 Famous Artworks by Leonardo da Vinci

An ancient egyptian hieroglyphic painted carving showing the falcon headed god Horus seated on a throne and holding a golden fly whisk. Before him are the Pharoah Seti and the goddess Isis. Interior wall of the temple to Osiris at Abydos, Egypt.

11 Egyptian Gods and Goddesses

Time zone map with standard time zones and International Date Line

Why Are Some Time Zones 30 Minutes Off Instead of an Hour?

Sydney New Years Eve Fireworks

Why Does the New Year Start on January 1?

medicinal leech: Media

annelid

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medicinal leech

medicinal leech

Medicinal leech (Hirudo verbana).

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