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Quote: Matter is a general term for the substance of which all physical objects are made,however in practice there is no single correct scientific meaning; each field uses the term in different and often contradictory ways. Whereas "matter" originally (in Aristotelian hylomorphism) referred not to an independent thing, but to a co-dependent "principle," the modern conception is that matter is a "substance" or entity unto itself, that is to say, it exists even apart from composing something else. Modern science identifies this "substance" through its physical properties; the most common current definition of matter is anything that has mass and occupies volume.However, this definition has to be revised[citation needed] in light of quantum mechanics, where the concept of "having mass", and "occupying space" are not as well-defined as in everyday life. A more general view is that bodies are made of several substances, and the properties of matter (including mass and volume) are determined not only by the substances themselves, but by how they interact. In other words, matter is made up of interacting "building blocks", the so-called particulate theory of matter. Matter is commonly said to exist in four states (or phases): solid, liquid, gas and plasma. However, advances in experimental technique have realized other phases, previously only theoretical constructs, such as Bose–Einstein condensates and Fermionic condensates. A focus on an elementary-particle view of matter also leads to new phases of matter, such as the quark–gluon plasma In physics and chemistry, matter exhibits both wave-like and particle-like properties, the so-called wave–particle duality. In the realm of cosmology, extensions of the term matter are invoked to include dark matter and dark energy, concepts introduced to explain some odd phenomena of the observable universe, such as the galactic rotation curve. These exotic forms of "matter" do not refer to matter as "building blocks", but rather to currently poorly-understood forms of mass and energy.