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Amoebae are the simplest type of protozoans, and are characterized by a feeding and dividing trophozoite stage that moves by temporary extensions called pseudopodia or false feet.

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Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.

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Signs of depression include feeling sad most of the time for 2 weeks or longer; loss of interest in things normally enjoyed; lack of energy; sleep and appetite disturbances; weight changes; feelings of hopelessness, helplessness, or worthlessness; an inability to make decisions; and thoughts of death and suicide.

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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.

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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.

The Tsavo Man-Eaters on display in the Field Museum of Natural History in Chicago, Illinois. The Tsavo Man-Eaters on display in the Field Museum of Natural History in Chicago, Illinois.
Suzuki Harunobu, Two Courtesans, Inside and Outside the Display Window. Suzuki Harunobu, Two Courtesans, Inside and Outside the Display Window.
Differences in how we display gender often lie below our awareness. How males and females use social ... Differences in how we display gender often lie below our awareness. How males and females use social ...
A beam-type torque wrench that displays the torque reading on the face of the dial. The beam display ... A beam-type torque wrench that displays the torque reading on the face of the dial. The beam display ...
Display of Canapés Display of Canapés
Tactile Display: Honeybee Dances Tactile Display: Honeybee Dances
Video: Structures that affect circulation - arterioles and vasomotor responses and venous return

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