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Prion: an abnormal pathogenic agent that is transmissible and able to induce abnormal folding of specific normal cellular proteins called prion proteins that are found most abundantly in the brain.
Spongiform encephalopathies: a group of rare degenerative brain disorders caused by prions and characterized by tiny holes that give the brain a “spongy” appearance.
Amyloid: an abnormal aggregate of protein.
Creutzfeldt-Jakob disease: also known as subacute spongiform encephalopathy or neurocognitive disorder due to prion disease, is an invariably fatal degenerative brain disorder. Early symptoms include memory problems, behavioral changes, poor coordination, and visual disturbances. Later symptoms include dementia, involuntary movements, blindness, weakness, and coma. About 70% of people die within a year of diagnosis.
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4:09
Why Do Heart Attacks Cause *Arm* Pain?
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Nerve: a whitish fiber or bundle of fibers that transmits impulses of sensation to the brain or spinal cord, and impulses from these to the muscles and organs.
Nerve impulse: a signal transmitted along a nerve fiber. It consists of a wave of electrical depolarization that reverses the potential difference across the nerve cell membranes.
Referred pain: pain perceived at a location other than the site of the painful stimulus/origin. It is the result of a network of interconnecting sensory nerves that supplies many different tissues.
Sensory cortex: the region of the brain that deals with sensory information.
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3:18
What Is The Best Shape For A Farm?
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Central pivot irrigation: an irrigation system that moves in a circular pattern around a central pivot point
Contour farming: tilling sloped land along lines of consistent elevation in order to conserve rainwater and to reduce soil losses from erosion
Strip cropping: partitioning a field into long, narrow strips which are alternated in a crop rotation system
Terracing: a method of farming consisting of building platforms along a slope
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4:35
Angiosperms and Gymnosperms
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Hardwoods and Softwoods
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From the creators of the popular science show with millions of YouTube subscribers comes the MinuteEarth podcast. Every episode of the show dives deep into a science question you might not even know you had - but once you hear the answer, you’ll want to share it with everyone you know. Our team of scientists digs into the research and breaks it down into a short, entertaining explanation jam-packed with science facts and terrible puns. We’ll tell the incredible story of how monkeys crossed the Atlantic ocean on natural rafts, and we’ll explain why it gets hotter the deeper you dig underground.
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