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In 1917, Marcel Duchamp submitted a urinal to an open exhibiton for the Society of Independent Artists. He presented it on its back, signed and dated “R.Mutt 1917”. The piece was never accepted into the exhi...

Lab studies allow for high control over extraneous variables. For example, in a simple experiment to test which paper aeroplane flies the furthest, the advantage of doing the study inside, in a controlled en...

Weather is the condition of the atmosphere, now or in the near future - e.g. sunny/raining. Climate is the average weather conditions in a particular place based on weather conditions of the past 30 years i....

Two species that transform into each other by loss or gain of a proton.

Tropomyosin helps to regulate myofibril contraction. Before contraction, tropomyosin covers the myosin binding sites on the actin molecule, preventing the myosin heads from binding. During contraction, calci...