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tracer

(Encyclopedia) tracer, an identifiable substance used to follow the course of a physical, chemical, or biological process. In chemistry the ideal tracer has the same chemical properties as the…

Anatomy and
Physiology: Sympathetic: Yikes!

Sympathetic: Yikes!Anatomy and PhysiologyThe Central and Peripheral Nervous SystemsYou've Got Some Nerve!Gyri and SulciThe Control CenterSensory and Motor ControlThalamus: The Switching…

Anatomy and
Physiology: You've Got Some Nerve!

You've Got Some Nerve!Anatomy and PhysiologyThe Central and Peripheral Nervous SystemsYou've Got Some Nerve!Gyri and SulciThe Control CenterSensory and Motor ControlThalamus: The Switching…

Advanced-Level Science Projects: Physical Science

Physical ScienceAdvanced-Level Science ProjectsPhysical ScienceCan a Visible Light Outshine Infrared Radiation?How Do Different Surfaces Affect the Momentum of Marbles? How Can You Use Physics to…

Anatomy and
Physiology: The Nervous System

The Nervous SystemAnatomy and PhysiologyThe Nervous SystemThe Great DivideSupport StaffNeuronsConnecting with SynapsesYou've Got Potential As the other control system, after the endocrine, the…

The Song of Hiawatha: Hiawatha's Childhood

The Four Winds Hiawatha and Mudjekeewis Hiawatha's Childhood Downward through the evening twilight, In the days that are forgotten, In the unremembered ages, From the full moon…

Smith, John, English colonist in America

(Encyclopedia) Smith, John, c.1580–1631, English colonist in America, b. Willoughby, Lincolnshire, England. A merchant's apprentice until his father's death in 1596, he thereafter lived an…

Anatomy and
Physiology: Vessels To and Fro

Vessels To and FroAnatomy and PhysiologyCardiovascular and Lymphatic CirculationVessels To and FroHere, There, EverywhereGoing Their Separate WaysOh, the Pressure!Drainage System As I discussed…