Mechanics
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(Arabic manuscript about a machine. Unknown date (estimated: 16th-19th centuries). Mechanics is a branch of physics whose object is the study of motion, deformations or equilibrium states of physical systems. This science aims to describe the movements of different kinds … Read More

Acoustics
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(Omnidirectional sound source in anechoic chamber (Czech Technical Univerzity, Prague). ) Acoustics is the science of sound (physics). The discipline has extended its field to the study of mechanical waves within gases, liquids, but also within solids, whatever the frequency … Read More

Epistemology and science
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Field of application of epistemology For a long time, epistemology has focused exclusively on the content of science, the history of this content, and the genealogy of the advances of this content. Science as a human institution was left to … Read More

Global warming: Temperature evolution
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 (Annual (thin lines) and five-year lowess smooth (thick lines) for the temperature anomalies averaged over the Earth’s land area and sea surface temperature anomalies (blue line) averaged over the part of the ocean that is free of ice at all … Read More

Interdisciplinarity
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Interdisciplinarity is the art of making people or teams from different scientific disciplines work together. The interest is to enrich approaches and solutions by promoting creativity and serendipity, to facilitate the achievement of a common goal by confronting different approaches … Read More

Physics
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Physics is the science that tries to understand, model, and explain the natural phenomena of the universe. It corresponds to the study of the world which surrounds us in all its forms, laws of its variation and evolution. System modeling … Read More

Observations related to the current global warming
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Various changes observed around the world have led to the conclusion of global warming. The Global Humanitarian Forum, Kofi Annan’s Think Tank, estimates in the first study on the human impact of global warming in 2009, to 300,000 deaths per … Read More

Study on the Origins of Dynamic Jets on Sun’s Surface
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A new NASA-funded study has revealed the origins of spicules – lengthy jets of plasma on the sun’s surface. Scientists have been observing these long strands of solar material since the end of the 19th century, but their origins have … Read More

The egg from the bottle
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Put a fresh egg in a glass of vinegar. Leave the egg in the vinegar until the hard crust dissolves and remains only an elastic membrane. Put the egg thus obtained in water. In 3-7 days, the egg will increase … Read More

Formalism and natural language in analytic philosophy
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Tradition, doctrine and method The definition of analytic philosophy remains ambiguous to the point that it has been argued that it is “preferable to speak of analytic philosophies in the plural.” It can be clarified by distinguishing three uses of … Read More

The cold flame
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A handkerchief can remain whole even if the flame burns. The handkerchief is soaked in water, wring well, then soak in a mixture of water and alcohol 1: 1. This mixture is flammable but burn with a incombustible flame.

Astrophysical constants and parameters
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(Barred spiral galaxy, Eridanus constellation) The following table contains the values of the constants and parameters commonly used in astrophysics and also more particularly in cosmology. Concerning the cosmological parameters, the ΛCDM model which is the basis of the standard … Read More

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