What Is Muscle?
What Is Muscle? Muscle is the body tissue which, because it has the power of contraction, enables the higher animals to move their bodies. Muscles are divided into two...
Read MoreWhat Is Muscle? Muscle is the body tissue which, because it has the power of contraction, enables the higher animals to move their bodies. Muscles are divided into two...
Read MoreWhy Do We Have Brains? The brain directs and coordinates movements and reflexes, registers sensations and is the supreme nervous organ by which man acquires knowledge...
Read MoreHow Do Certain Drugs Put Us to Sleep? Some drugs, called hypnotics, put us to sleep by producing a depressive or slowing-down effect on our central nervous system. They...
Read MoreWhat Are Mercenaries? Mercenaries are soldiers who give their services, and if necessary, their lives, to anyone who will pay them enough to do so. They fight for money...
Read MoreWhat Makes Jumping Beans Jump? Jumping beans are made to jump by the action of little insects inside them. The beans are the long seed of certain Mexican shrubs and...
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