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Hace 5 días · For other uses, see Wave (disambiguation). Surface waves in water showing water ripples. In physics, mathematics, engineering, and related fields, a wave is a propagating dynamic disturbance (change from equilibrium) of one or more quantities. Periodic waves oscillate repeatedly about an equilibrium (resting) value at some frequency.
Hace 3 días · Sunscreen. Sunscreen, also known as sunblock [a] or sun cream, is a photoprotective topical product for the skin that helps protect against sunburn and prevent skin cancer. Sunscreens come as lotions, sprays, gels, foams (such as an expanded foam lotion or whipped lotion [4] ), sticks, powders and other topical products.
Hace 2 días · Diabetes mellitus, often known simply as diabetes, is a group of common endocrine diseases characterized by sustained high blood sugar levels. [10] [11] Diabetes is due to either the pancreas not producing enough insulin, or the cells of the body becoming unresponsive to the hormone's effects. [12] Classic symptoms include thirst, polyuria ...
Hace 1 día · t. e. Psychology is the study of mind and behavior. [1] Its subject matter includes the behavior of humans and nonhumans, both conscious and unconscious phenomena, and mental processes such as thoughts, feelings, and motives. Psychology is an academic discipline of immense scope, crossing the boundaries between the natural and social sciences.
Hace 5 días · Smoking cessation, usually called quitting smoking or stopping smoking, is the process of discontinuing tobacco smoking. [1] Tobacco smoke contains nicotine, which is addictive and can cause dependence. [2] [3] As a result, nicotine withdrawal often makes the process of quitting difficult. Smoking is the leading cause of preventable death and a ...
Hace 1 día · Cricket is a bat-and-ball game that is played between two teams of eleven players on a field at the centre of which is a 22-yard (20-metre) pitch with a wicket at each end, each comprising two bails balanced on three stumps. Two players from the batting team (the striker and nonstriker) stand in front of either wicket holding bats, with one ...
Hace 2 días · History (derived from Ancient Greek ἱστορία (historía) 'inquiry; knowledge acquired by investigation') [1] is the systematic study and documentation of the human past. [2] [3] The period of events before the invention of writing systems is considered prehistory. [4] ". History" is an umbrella term comprising past events as well as the ...
