Central Nervous System

Central nervous system (CNS) is the part of the nervous system consisting primarily of the brain and spinal cord. Not all animals with a central nervous system have a brain, although the large majority do. It is a structure composed of nervous tissue, especially white and gray matter, positioned along the rostral to caudal axis … Continue reading Central Nervous System


Rocket obtains thrust from a rocket engine. Rocket engine exhaust is formed entirely from propellant carried within the rocket. Rocket engines work by action and reaction and push rockets forward simply by expelling their exhaust in the opposite direction at high speed, and can therefore work in the vacuum of space. In fact, rockets work … Continue reading Rocket

Collision theory

Collision theory states that when suitable particles of the reactant hit each other with correct orientation, only a certain amount of collisions result in a perceptible or notable change; these successful changes are called successful collisions. ©Socratic Collision theory was proposed independently by Max Trautz in 1916 and William Lewis in 1918. Consider the bimolecular elementary reaction: A + B → … Continue reading Collision theory

Hemispatial neglect

Hemispatial neglect is a neuropsychological condition in which, after damage to one hemisphere of the brain is sustained, a deficit in attention to and awareness of one side of the field of vision is observed. It is defined by the inability of a person to process and perceive stimuli on one side of the body or environment, where … Continue reading Hemispatial neglect

Robot kinematics

Robot kinematics applies geometry to the study of the movement of multi-degree of freedom kinematic chains that form the structure of robotic systems. The emphasis on geometry means that the links of the robot are modeled as rigid bodies and its joints are assumed to provide pure rotation or translation. A fundamental tool in robot … Continue reading Robot kinematics


Entropy is a scientific concept as well as a measurable physical property that is most commonly associated with a state of disorder, randomness, or uncertainty. The term and the concept are used in diverse fields, from classical thermodynamics, where it was first recognized, to the microscopic description of nature in statistical physics, and to the principles … Continue reading Entropy

Quantum algorithm

Quantum algorithm is an algorithm which runs on a realistic model of quantum computation, the most commonly used model being the quantum circuit model of computation. A classical (or non-quantum) algorithm is a finite sequence of instructions, or a step-by-step procedure for solving a problem, where each step or instruction can be performed on a … Continue reading Quantum algorithm

Id, ego and superego

The id, ego, and super-ego are a set of three concepts in psychoanalytic theory describing distinct, interacting agents in the psychic apparatus (defined in Sigmund Freud's structural model of the psyche). The three agents are theoretical constructs that describe the activities and interactions of the mental life of a person. ©Simply Psychology The Id is … Continue reading Id, ego and superego

Space in mathematics

Space is a set with some added structure. While modern mathematics uses many types of spaces, such as Euclidean spaces, linear spaces, topological spaces, Hilbert spaces, or probability spaces, it does not define the notion of "space" itself. ©Wikipedia A space consists of selected mathematical objects that are treated as points, and selected relationships between these points. The nature of the points can vary … Continue reading Space in mathematics

Synaptic plasticity

Synaptic plasticity is the ability of synapses to strengthen or weaken over time, in response to increases or decreases in their activity. Since memories are postulated to be represented by vastly interconnected neural circuits in the brain, synaptic plasticity is one of the important neurochemical foundations of learning and memory. Plastic change often results from the alteration of the number of neurotransmitter receptors located on a synapse. There are several underlying … Continue reading Synaptic plasticity