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  1. Vor 23 Stunden · Spin is an intrinsic form of angular momentum carried by elementary particles, and thus by composite particles such as hadrons, atomic nuclei, and atoms. [1] [2] : 183 –184 Spin is quantized, and accurate models for the interaction with spin require relativistic quantum mechanics or quantum field theory . The existence of electron spin ...

  2. Vor 23 Stunden · Some of the major unsolved problems in physics are theoretical, meaning that existing theories seem incapable of explaining a certain observed phenomenon or experimental result. The others are experimental, meaning that there is a difficulty in creating an experiment to test a proposed theory or investigate a phenomenon in greater detail.

  3. en.wikipedia.org › wiki › AtheismAtheism - Wikipedia

    Vor 23 Stunden · Atheism, in the broadest sense, is an absence of belief in the existence of deities. Less broadly, atheism is a rejection of the belief that any deities exist. In an even narrower sense, atheism is specifically the position that there are no deities. Atheism is contrasted with theism, which in its most general form is the belief that at least ...

  4. en.wikipedia.org › wiki › ChristianityChristianity - Wikipedia

    Vor 23 Stunden · Christianity The Church of the Holy Sepulchre in the Christian Quarter of the Old City of Jerusalem, the holiest Christian site Classification Abrahamic Scripture Bible Theology Monotheistic Region Worldwide Language Biblical Hebrew, Biblical Aramaic, Biblical Greek, Ecclesiastical Latin Territory Christendom Founder Jesus Christ Origin 1st century AD Judaea, Roman Empire Separated from Second ...