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why are horses measured in hands

Why Are Horses Measured in Hands?

Before man invented rulers and tape measures he often used his hands and feet to express the size of things. An old book published…

what is angelman syndrome

What Is Angelman Syndrome?

Angelman syndrome (AS) is a neurogenetic disorder characterized by intellectual and developmental delay, sleep disturbance, seizures, jerky movements (especially hand-flapping), frequent laughter or smiling,…

what is ballast on a railroad track

What Is Ballast on a Railroad Track?

Railroad ballast serves as a bed for railroad tracks and provides track stability, drainage, and support of significant loads carried by railcars. In addition,…