{"page":"\u003clink rel=\"stylesheet\" href=\"https://lessonplanet.com/assets/packs/css/resources-c03aa079.css\" /\u003e\n\u003clink rel=\"stylesheet\" href=\"https://lessonplanet.com/assets/packs/css/lp_boclips_stylesheets-517835be.css\" media=\"all\" /\u003e\n\u003cdiv data-title='Do Photons Cast Shadows?' data-url='/boclips/videos/5f7dd1738cd8ed7a1e388da1' data-video-url='/boclips/videos/5f7dd1738cd8ed7a1e388da1' id='bo_player_modal'\u003e\n\u003cdiv class='boclips-resource-page modal-dialog panel-container'\u003e\n\u003cdiv class='react-notifications-root'\u003e\u003c/div\u003e\n\u003cdiv class='rp-header'\u003e\n\u003cdiv class='rp-type'\u003e\n\u003ci aria-hidden='true' class='fai fa-regular fa-circle-play'\u003e\u003c/i\u003e\nVideo\n\u003c/div\u003e\n\u003ch1 class='rp-title' id='video-title'\u003e\nDo Photons Cast Shadows?\n\u003c/h1\u003e\n\u003cdiv class='rp-actions'\u003e\n\u003cdiv class='mr-1'\u003e\n\u003ca class=\"btn btn-success\" data-posthog-event=\"Signup: LP Signup Activity\" data-posthog-location=\"body_link_boclips\" data-remote=\"true\" href=\"/subscription/new\"\u003e\u003cspan\u003e\u003cspan\u003eGet Free Access\u003c/span\u003e\u003cspan class=\"\"\u003e for 10 Days\u003c/span\u003e\u003cspan\u003e!\u003c/span\u003e\u003c/span\u003e\u003c/a\u003e\n\u003c/div\u003e\n\u003c/div\u003e\n\u003c/div\u003e\n\u003cdiv class='rp-body'\u003e\n\u003cdiv class='rp-info'\u003e\n\u003cdiv aria-label='Hide resource details' class='rp-hide-info' role='button' tabindex='0'\u003e\u0026times;\u003c/div\u003e\n\u003ci aria-label='Expand resource details' class='rp-expand-info fai fa-solid fa-up-right-and-down-left-from-center' role='button' tabindex='0'\u003e\u003c/i\u003e\n\u003ci aria-label='Compress resource details' class='rp-compress-info fai fa-solid fa-down-left-and-up-right-to-center' role='button' tabindex='0'\u003e\u003c/i\u003e\n\u003cdiv class='rp-rating'\u003e\n\u003cspan class='resource-pool'\u003e\n\u003cspan class='pool-label'\u003ePublisher:\u003c/span\u003e\n\u003cspan class='pool-name'\u003e\n\u003cspan class='text'\u003e\u003ca data-publisher-id=\"30358008\" href=\"/search?publisher_ids%5B%5D=30358008\"\u003eMinutePhysics\u003c/a\u003e\u003c/span\u003e\n\u003c/span\u003e\n\u003c/span\u003e\n\u003c/div\u003e\n\u003cdiv class='rp-description'\u003e\n\u003cspan class='short-description'\u003eThis video is about two-photon (gamma-gamma) physics, and how photons can interact with each other - either mediated by a passing lepton, or gravitationally via lensing, or via vacuum fluctuation pair production of vertical particles...\u003c/span\u003e\n\u003cspan class='full-description hide'\u003eThis video is about two-photon (gamma-gamma) physics, and how photons can interact with each other - either mediated by a passing lepton, or gravitationally via lensing, or via vacuum fluctuation pair production of vertical particles (electron-positron pair, for example). This is the so-called \"box diagram\" feynman diagram.\u003cbr/\u003e\u003cbr/\u003eREFERENCES\u003cbr/\u003e\u003cbr/\u003eWater waves interact with each other (weakly nonlinear shallow water \u003ca href='https://en.wikipedia.org/wiki/Korteweg%E2%80%93deVriesequation' target='_blank' rel='nofollow'\u003ewaves)\u003c/a\u003e\u003cbr/\u003e\u003ca href='http://mathworld.wolfram.com/Korteweg-deVriesEquation.html' target='_blank' rel='nofollow'\u003e\u003c/a\u003e\u003cbr/\u003e\u003cbr/\u003ePaper: Absorption of Very High Energy Gamma Rays in the Milky \u003ca href='https://arxiv.org/pdf/1608.01587.pdf' target='_blank' rel='nofollow'\u003eWay\u003c/a\u003e\u003cbr/\u003e\u003cbr/\u003ePaper: Observing light-by-light scattering at the Large Hadron Collider (\u003ca href='https://arxiv.org/pdf/1305.7142.pdf' target='_blank' rel='nofollow'\u003eLHC)\u003c/a\u003e\u003cbr/\u003e\u003cbr/\u003eMass-Energy \u003ca href='http://labs.minutelabs.io/Mass-Energy-Scale/' target='_blank' rel='nofollow'\u003eScale\u003c/a\u003e\u003cbr/\u003e\u003cbr/\u003eOptical \u003ca href='https://en.wikipedia.org/wiki/Opticaldepth' target='_blank' rel='nofollow'\u003eDepth\u003c/a\u003e\u003cbr/\u003e\u003cbr/\u003eThe electromagnetic spectrum and photon \u003ca href='http://labman.phys.utk.edu/phys222core/modules/m6/The%20EM%20spectrum.html' target='_blank' rel='nofollow'\u003eenergies\u003c/a\u003e\u003cbr/\u003e\u003cbr/\u003eGravitational \u003ca href='http://andybohn.com/research/lensing.html' target='_blank' rel='nofollow'\u003eLensing\u003c/a\u003e\u003cbr/\u003e\u003cbr/\u003eAsk an Astrophysicist on gamma ray scattering and energies in \u003ca href='http://teacherlink.ed.usu.edu/tlnasa/reference/imaginedvd/files/imagine/docs/askastro/answers/970412e.html' target='_blank' rel='nofollow'\u003ecosmology\u003c/a\u003e\u003cbr/\u003e\u003cbr/\u003eMeasuring Vacuum Polarisation with High Power \u003ca href='https://arxiv.org/pdf/1510.08456.pdf' target='_blank' rel='nofollow'\u003eLasers\u003c/a\u003e\u003cbr/\u003e\u003cbr/\u003eDetecting vacuum birefringence with X-ray free electron lasers and high-power optical \u003ca href='https://indico.desy.de/indico/event/12654/session/2/contribution/8/material/slides/0.pdf' target='_blank' rel='nofollow'\u003elasers\u003c/a\u003e\u003cbr/\u003e\u003cbr/\u003eVacuum birefringence in the head-on collision of XFEL and optical high-intensity laser \u003ca href='https://arxiv.org/pdf/1807.03302.pdf' target='_blank' rel='nofollow'\u003epulses\u003c/a\u003e\u003cbr/\u003e\u003cbr/\u003eATLAS makes first direct detection of Light-by-light scattering at the \u003ca href='https://atlas.cern/updates/press-statement/atlas-sees-first-direct-evidence-light-light-scattering-high-energy' target='_blank' rel='nofollow'\u003eLHC\u003c/a\u003e\u003cbr/\u003e\u003cbr/\u003eTwo Photon \u003ca href='http://www.hep.ucl.ac.uk/opal/gammagamma/gg-tutorial.html' target='_blank' 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