Science is the attempt to answer questions through the systematic collection and analysis of objective, observable data.

Clever Hans was a horse, which had received an education and seemed to be able to answer a lot of questions, including arithmetic questions. This was, in fact, not true. The horse was able to recognize visual signals to which he

The brain contains a lot of nerve cells or neurons. The points of communication between neurons are called synapses. The brain and the spinal cord make up the central nervous system. Extensions from the central nervous system, called nerves, make up the peripheral nervous system. The difference between a neuron and a nerve is that a nerve is

Photoreceptors are specialized light-detecting cells. One possible evolutionary road of the eyes is the following: photoreceptors became concentrated in groups, they began to form light detecting organs and this light-detecting organ developed until it became the eye as we know it today.

The front of the eyeball is covered by the cornea, a transparent tissue. Here

In a model on how the memory works there are three types of memory stores:

1. Sensory memory
   There is some information stored here for a couple of seconds even when you are not paying attention to it (e.g: you can remember things you hear for approximately 4 seconds after you heard it, even if you