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Explore Do Photons Cast Shadows? with 620,560 views, 25,097 likes, and 942 comments. Experience the impact of this video content that has captured audience attention.

Thanks to Nebula for their support. Go to https://nebula.tv/minutephysics to get Nebula! Support MinutePhysics on Patreon! http://www.patreon.com/minutephysics Link to Patreon Supporters: http://www.minutephysics.com/supporters/ This 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. REFERENCES Water waves interact with each other (weakly nonlinear shallow water waves) https://en.wikipedia.org/wiki/Korteweg%E2%80%93deVriesequation http://mathworld.wolfram.com/Korteweg-deVriesEquation.html Paper: Absorption of Very High Energy Gamma Rays in the Milky Way https://arxiv.org/pdf/1608.01587.pdf Paper: Observing light-by-light scattering at the Large Hadron Collider (LHC) https://arxiv.org/pdf/1305.7142.pdf Mass-Energy Scale http://labs.minutelabs.io/Mass-Energy-Scale/ Optical Depth https://en.wikipedia.org/wiki/Opticaldepth The electromagnetic spectrum and photon energies http://labman.phys.utk.edu/phys222core/modules/m6/The%20EM%20spectrum.html Gravitational Lensing http://andybohn.com/research/lensing.html Ask an Astrophysicist on gamma ray scattering and energies in cosmology http://teacherlink.ed.usu.edu/tlnasa/reference/imaginedvd/files/imagine/docs/askastro/answers/970412e.html Measuring Vacuum Polarisation with High Power Lasers https://arxiv.org/pdf/1510.08456.pdf Detecting vacuum birefringence with X-ray free electron lasers and high-power optical lasers https://indico.desy.de/indico/event/12654/session/2/contribution/8/material/slides/0.pdf Vacuum birefringence in the head-on collision of XFEL and optical high-intensity laser pulses https://arxiv.org/pdf/1807.03302.pdf ATLAS makes first direct detection of Light-by-light scattering at the LHC https://atlas.cern/updates/press-statement/atlas-sees-first-direct-evidence-light-light-scattering-high-energy Two Photon Physics http://www.hep.ucl.ac.uk/opal/gammagamma/gg-tutorial.html https://en.wikipedia.org/wiki/Two-photonphysics Thesis: The Opacity of the Universe for high and very high energy γ-rays http://inspirehep.net/record/1254304/files/desy-thesis-13-033.pdf MinutePhysics is on twitter - @minutephysics And facebook - http://facebook.com/minutephysics And Google+ (does anyone use this any more?) - http://bit.ly/qzEwc6 Minute Physics provides an energetic and entertaining view of old and new problems in physics -- all in a minute! Created by Henry Reich

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