It looks like this is a web page, not a feed. I looked for a feed associated with this page, but couldn't find one. Please enter the address of your feed to validate.

Source: https://mit-edu-0249681753-gov.caltech-edu.pp.ua/post/0249681753

  1. <!DOCTYPE html><html lang="en-US"><head><title>Just a moment...</title><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=Edge"><meta name="robots" content="noindex,nofollow"><meta name="viewport" content="width=device-width,initial-scale=1"><style>*{box-sizing:border-box;margin:0;padding:0}html{line-height:1.15;-webkit-text-size-adjust:100%;color:#313131;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,Noto Sans,sans-serif,Apple Color Emoji,Segoe UI Emoji,Segoe UI Symbol,Noto Color Emoji}body{display:flex;flex-direction:column;height:100vh;min-height:100vh}.main-content{margin:8rem auto;max-width:60rem;padding-left:1.5rem}@media (width <= 720px){.main-content{margin-top:4rem}}.h2{font-size:1.5rem;font-weight:500;line-height:2.25rem}@media (width <= 720px){.h2{font-size:1.25rem;line-height:1.5rem}}#challenge-error-text{background-image:url(data:image/svg+xml;base64,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);background-repeat:no-repeat;background-size:contain;padding-left:34px}@media (prefers-color-scheme:dark){body{background-color:#222;color:#d9d9d9}}</style><meta http-equiv="refresh" content="390"></head><body class="no-js"><div class="main-wrapper" role="main"><div class="main-content"><noscript><div class="h2"><span id="challenge-error-text">Enable JavaScript and cookies to continue</span></div></noscript></div></div><script>(function(){window._cf_chl_opt={cvId: '3',cZone: "mit-edu-0249681753-gov.caltech-edu.pp.ua",cType: 'managed',cRay: '90fe6cdd0c0da29a',cH: 'whWYmr5xdPiddjjAmZnoLuFxTqaTkV5ejQ9FZ0H3dQM-1739214898-1.2.1.1-iwId0Obco2wyvpumMdZ19HwJQgjqS65AVaaEF1pjOgj3sWcYGWAvTTpyDJ65fYqp',cUPMDTk: "\/post\/0249681753?__cf_chl_tk=vV2pBlippFyjXfM7Oj0LfLlcSWbaVyl.cNSY9LCQz50-1739214898-1.0.1.1-h0PxpjJ29fLldP5A_rgc0Gc4GyPVNrkW9bFHukULcdA",cFPWv: 'g',cITimeS: '1739214898',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/post\/0249681753?__cf_chl_f_tk=vV2pBlippFyjXfM7Oj0LfLlcSWbaVyl.cNSY9LCQz50-1739214898-1.0.1.1-h0PxpjJ29fLldP5A_rgc0Gc4GyPVNrkW9bFHukULcdA",md: "sWIyCaUJ5O.EkT8ZzXXrEJwBbV.BUBP5qAipqLxg2Bg-1739214898-1.2.1.1-Pg6cRcQ.Z2zJR8XZLAEw9Gl4zPMRd3M.1mapDE8m7hhLwSfHYVXVe3rziFTDzCiiH_151xcEXky5wV0ITRBQc2Zo372jA4._e0E4NL4OT5gk7z0tXj8Wn3llo1FKhkkfIknbI0fkhJvcQ.OmEWyZwWDJShB9s0s54_A6eYUIFXb9AN.g3D97N0iZVD0XhGPUTbrxdNBqjFR3EQ3Q7MsWNxCirt3tAMZ9wVT9MMnQtr.BP2zrq32jaxeejmlpRHJMqvfqLU45g9JFz4X4nqnXplF5ZKUBR.iSlcLexpID6sPaxT7yyersriL2sD.605X4trloap79kUb4eMrP_N1T5r6LEIwkDU2qSMiJaVTzlWyIVeABQca39gPviIj0mOlMIwtS03RLtWk3T_u7HhEWqD_U.9AvFhjdt6QBQRYx.IfQ18Q8x78wqT7pLflImOo8PBt8qL_AqC9py0KP2Y0tbD3trQdNJNZUyjz28w0h1qGb3D1L9_f7VdDSeWTvv6JyWTXYfVrTpCa637ww21TI1EsnezAb8o6RskQvcwPHWlRj9RwGTbdnPpVbSa3MBmbWWyJxbvARlEjz7L1TjPS3IRof9UsI.T5fkPKxzhPHrS0oc_awGYdLu9lpoS10DacIO6z0TWOBm9sbCGwRaEwjI5XMsKCWi.ojhC73ZWwdPgBdnNjcX.ByGVpwDsMYACXGWXkdtxUBeNvhwVzbX.EcIIiyF3b3dT91HfOvP.EQf1Bq0CTtnzTMS2yPOJqIsmOQvFKbOsX19Ai7LEWToj7.CU7HYMz.0EpMPApJvvgP6js5NNbC9XeAf0rZqgqq8H6jdItQOnMx8zgwWpLtdUFi4C4ePPkAt3D0f0FeZGkYT0UmFHo6g10F6d_Emt3u59rBSObED_Ss9SWmLGvZyNjIzXB18V9Mn6qNcuL4.pNB8V_oOJWtwUiVjbSQm9dMxY6wkxJ9IK1IJmiIdvhN8OOkGiJZi91q.RiqSQH2zo17YrtcfbyL6EoXmsOsCjnu5UazdyXVkD5h3tEjt7GbxM22dr8As88wuTlteVYESKzG_lCoHB1L404F_Qae3WNWMhL5ZVDhXSRbgDum.uwK_hP.BvJ7waRKRTqPiPahP.KqXcnCJJ6JIzcTBSG2gdA1mwQtAsZGxjrMaaAuFtfFcA38YiXvgJlqDdrb5ijv2ZWo8DRuOugiz.chlc_jyrLZuz567cD8p.MxF.sEUMKx46Sa9PcEZ3Tgj0S9cm3Fp641lB_wACeSRR8Vj3phqwEnSXR9kSC3yr2lHEcsEanwx6OdSG4iFrCo1CPUwrw_R0z50fivLyC8t2LS.u0437rXxsvKIIpT_YVVWcuQA86kaydqDxJp.bhkT08VSiQhFmST6XoyPDZYYC4eZcUppI21MVo29.2cSh_WySwICoQKo4_7YSaKbtTc4fuwBVwCrOTbtziYNtTKrO8D7kQdIt.XJvGMl1N2H_WB46K9DXL5W88hbvG0ewrHrAOJIlcT0ef92e.dDJ5E7oH2TFFeR8KEGhZKecQ007eta9AdyujHgZuzQ4W_Pf77uzUwqnNmqVIuwwLrEgxSakVygltN4Txdh948ro212fb5X5_PZKeznwXoPWrX_BO1xTHiTo7l9gScukW_TFn_9bNHM3zziAAPHKXWbWqTwaMrCUyd9krTi6GsISX_3BbLye4b2l1UrAbm4LntyIL4Az.x7XMqsYNdKRRjDPsCA0FYUUrLG0DrEflUbqJlh21PqQ3d19fVkmuBS2ivbdKk9ASJZjh_CN3KdrHICfO.oYJPSl46GwUt8Q7VVFT4ehKMGx_YbjWnvVmUPXaqJtYu8XnkkVb0V9eLzLZXUZkoqOCsuqsroazEUYR_ugRMmi31jSpKfU7OmhLy_8OaE6llkFXfUBM1m.y_RzorgILCT5v1HQYL6MX.Wr9K4U5J7uGeUdvUSQVYIxcdQXvpr7o9iuQTE8OseCxQ7j17v5bvyWsbK.bBGuC6li_HLXzc6mEMcRc_HiZnRIwqybJiupdqPINGn4.jIx2vRkrx4hlIqz0YqnJLY.24bJ.CwVbK07L97Gy5DGvV0MaZyFnxKMRMPAmp8C1Qu0FlCX7v6lvl1b5YfkbtvN4PClY9XX_k6HFCJSCA6EYYCXwFDK_AaloODHMYEHEPRhmZNiPfoT.HkRQduyAUueXojGdeGfqGjavM7MgqC5iNXwrnHSlJnlxz0KUkTQkoSV2UYyhsAqbLh2a5BwVRsXVpJIeBGQ",mdrd: "fhzhYGIzqfVil5NOO.iACJu3pyTVw5SZrDtZHHLgqrw-1739214898-1.2.1.1-kSLv3FuOILxuJUIA7JHDxgiM5Mr02Wrh.hnbXpdFULXqdzfKbpVb_5yScPH8Wv7mI9LrHSZhj9lRS37lpB36uY5lUXRocIZvpb7.HCbxReqoiRBLwMa0cr66Nyfm6ocvDwLJQ1yb6tGSovaem8CR6AjWUT4miW7hxZERI9O_XiqbGSGl9jhFUrZBmsEZhxCDKip1Cs.2Uj_tOpvw8YD9t48cHiiFjJjMsyUIAhviI3ld2HIgpJ17J_OFhxvqbME80meZcwtgEn.y6hILTwALNCPPLZdKwAY8lNbz2dkLoeIuLl5HXYxeGUFTGsnb9xi01W3YtjtTEbZitoxRozx4pzHJ_NhPUEQsHxvaVtjViSusmHnOAhwqac.m0ll._xKORxWb6nn7W726sWipUKjTtfc1nLF1wR_jjpYJVUrl9KOYB.ye.fm2L4ddJjv82dtuD0Yqc9fENuPW_o3URdbPeUd6c13vA3g5HxWGL9254wWGRP0kN4zndne64Zi8Llvbd3glD5nKJQ2qmqjcQKwPbnbOrEW11ZXhX565zL8eWsY5r.M9wiG9PQQVgiVPs8PgLwNGv9a42fazTaUuwrsTgkvLgDf2RbL2gxfkriUBjWnv79KD1GSpdDAVH8zzTizQ48vr661SYWFQRicYG0YzVxXMZRpqvp7GLMU6gbLqOo6YbFkElEynhzSfgjH81fMYeqn7ySz_MccovhuFsv05cgwmudoeA5rH4TpZgvNA72qxffZqjznFznOID3oXZPGk3f42Nd.NpA2SwUaJbr54q282uMhS2vX5xlmevRIUkEviq7FpI3ieBUa.o64cB1K5sFV4cIPE1qX3pkvOh25xxqxpKprC69R3EWSEZdMCzvHBJjhOHFVW3m00.MOjClzr4TAQ8ZI8qubeio.gqdybUs_w8Bemr3YybzjesZm7BfilAhXQScW1diZMRiVy9_qmtXrn2qQ5gP_OnRupYPAuyC3DctxcSY8FM4wbtXL.qadaKAKLFeVcdV3qGQjxNPz36zqaNZTi43GUWLGx90oU33_YfTo11aacea7h.qXxZG.9ZBj17Od4goYqnNof9q.7BHSiCxcV1af_C3rQaB84uVfQZMwjr2c1XzKiFl1bJ7UUsneo7vhaTg6csHzbPVKTBxTTjZkQgZiNnBdp.5aLlBdbUpkBhNhrc_f5hYBQtMng.gkSd9VxPWRyxQgVphzPa7NHM.eqVaubMlrlCkcw3zXz1hyHvH3n8QCP6pw2svR2zSM8E3lBNaL985KnIcMYsrfI4ffefd5Nz5pgmtljAy3IecNmQT3AvmlSiUTNyVsaUBvSmqFL49RLWoXaRaSz5Mutxl2NdiuwkmQ0Dy6970DpcR_n7oumy_rochq3Vx_tNFI9GiA0J0t2uCruWwbMcE.1z7rya2hvE.7t5ph8iFh76C411X_ruE.dwO2zTKTANt_V7L04IWCEYf.VeLE0K8FnHss_GOowgham4vWqE1hxpHZ8PXCCGfOFJBVpUiD0.qBBDAxnshx7yEaXWHb.KZ6UQTX.YBhvDVAY31eVa.aLd4vICoFwuNJw6FKyd7St0OQYlSk7qw0nVw.IAJpJbGlMDs.QEWVxYikW4aG._mYAtU4mcUUSQ_bJo_DdstYpi48CeeJ7TnUg_qslB2Sw2SVa6S2OfdNoIKSlaw880zfAJ.REq0Xyu1OLgwoi1iZjeMudy3yWbsuM8iSQOOJupt8PsBvJefO5Y_awDnhzWk_Js9gQLZCAcytODgdw8GbWc_8M9x1KE2mhW2sm3Q7xYraAtHus2.cMCp2.pmFQm0mAPt9A6kB2ewOfVPRx6YzZ6g80JolymnuZXRxppS0VFdVNV8t.LNCgIeJk5PQG0Q"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=90fe6cdd0c0da29a';window._cf_chl_opt.cOgUHash = location.hash === '' && location.href.indexOf('#') !== -1 ? '#' : location.hash;window._cf_chl_opt.cOgUQuery = location.search === '' && location.href.slice(0, location.href.length - window._cf_chl_opt.cOgUHash.length).indexOf('?') !== -1 ? '?' : location.search;if (window.history && window.history.replaceState) {var ogU = location.pathname + window._cf_chl_opt.cOgUQuery + window._cf_chl_opt.cOgUHash;history.replaceState(null, null, "\/post\/0249681753?__cf_chl_rt_tk=vV2pBlippFyjXfM7Oj0LfLlcSWbaVyl.cNSY9LCQz50-1739214898-1.0.1.1-h0PxpjJ29fLldP5A_rgc0Gc4GyPVNrkW9bFHukULcdA" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>
Copyright © 2002-9 Sam Ruby, Mark Pilgrim, Joseph Walton, and Phil Ringnalda