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  2. Prism (Katy Perry album) - Wikipedia

    en.wikipedia.org/wiki/Prism_(Katy_Perry_album)

    Prism is the fourth studio album by American singer Katy Perry. It was released by Capitol Records on October 18, 2013. While the album was initially planned to be "darker" than her previous material, Prism ultimately became a prominently dance-inspired record. Perry worked with several past collaborators, while enlisting new producers and ...

  3. National debt of the United States - Wikipedia

    en.wikipedia.org/wiki/National_debt_of_the...

    The federal debt at the end of the 2018/19 fiscal year (ended September 30, 2019) was $22.7 trillion (~$27.1 trillion in 2023). The portion that is held by the public was $16.8 trillion. Neither figure includes approximately $2.5 trillion owed to the government. [83] Interest on the debt was $404 billion.

  4. Fermi paradox - Wikipedia

    en.wikipedia.org/wiki/Fermi_paradox

    This is an accepted version of this page This is the latest accepted revision, reviewed on 23 September 2024. Discrepancy between lack of evidence of advanced alien life and apparently high likelihood it exists This article is about the absence of clear evidence of extraterrestrial life. For a type of estimation problem, see Fermi problem. Enrico Fermi (Los Alamos 1945) The Fermi paradox is ...

  5. Photon - Wikipedia

    en.wikipedia.org/wiki/Photon

    Condensed. I (J P C)=0,1 (1 −−) [ 1 ] A photon (from Ancient Greek φῶς, φωτός (phôs, phōtós) 'light') is an elementary particle that is a quantum of the electromagnetic field, including electromagnetic radiation such as light and radio waves, and the force carrier for the electromagnetic force.

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