Every Chemistry student is familiar with terms significant figures, accuracy, precision, error, average value and the measure of error -- standard deviation. They are however, not made to realize that this pleasure of error, standard deviation is a very fundamental quantity and concept as well. With standard deviation are associated phenomena / quantity like fluctuation, normal distribution, random walk / Brownian movement, diffusion, spread of wave packet, the various uncertainty principles including Heisenberg uncertainty principle, and big bang theory. Chemistry students are also not aware that the ground state energy of helium-like atoms can be estimated using Heisenberg uncertainty principle. Thus starting from the simple definition of this measurement of error - the standard deviation – an attempt is made here to make Chemistry research workers realize that the above mentioned phenomena are related to or can be considered as manifestation of this quantity of error.