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Observation is either an activity of a living being, such as a human, consisting of receiving knowledge of the outside world through the senses, or the recording of data using scientific instruments. The term may also refer to any data collected during this activity. An observation can also be the way you look at things or when you look at something.
The scientific method requires observations of nature to formulate and test hypothesis. It consists of these steps:

Asking a question about a natural phenomenon
Making observations of the phenomenon
Hypothesizing an explanation for the phenomenon
Predicting a logical consequence of the hypothesis
Testing the hypothesis by an experiment, an observational study, or a field study
Creating a conclusion with data gathered in the experiment


Senses are limited, and are subject to errors in perception such as optical illusions. Scientific instruments were developed to magnify human powers of observation, such as weighing scales, clocks, telescopes, microscopes, thermometers, cameras, and tape recorders, and also translate into perceptible form events that are unobservable by human senses, such as indicator dyes, voltmeters, spectrometers, infrared cameras, oscilloscopes, interferometers, geiger counters, x-ray machines, and radio receivers....etc..wikipedia: observation

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