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-1748239506-gov.caltech-edu.pp.ua/post/100851003754

  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-1748239506-gov.caltech-edu.pp.ua",cType: 'managed',cRay: '90fedbb26a4cff1d',cH: 'xAHt_l1_uRnKbd1jRWIhDFsdWmXRjNFedj_PiKBMxco-1739219438-1.2.1.1-_KcSyfWbgcIARaCk1aFVNrSBTZAZW27_AJseV0vRn5aoJLHc4goLT9hxs.Edrh4C',cUPMDTk: "\/post\/100851003754?__cf_chl_tk=H4kcSo4.Y0JJFTY.iXNpd0FrS_eemDq8tydI906sP_E-1739219438-1.0.1.1-06XWgFFzbBclYeifiHMe6KB0o2LPGb0uwhV41h6XO64",cFPWv: 'g',cITimeS: '1739219438',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/post\/100851003754?__cf_chl_f_tk=H4kcSo4.Y0JJFTY.iXNpd0FrS_eemDq8tydI906sP_E-1739219438-1.0.1.1-06XWgFFzbBclYeifiHMe6KB0o2LPGb0uwhV41h6XO64",md: "mhvfd7_0sRJO4B9UV.UIDLC5OVvXZ3y49tZz.Ou3djk-1739219438-1.2.1.1-xahr8IM8QLJMEKJTgEDS9Cj0VWA0FN6fFf0IJNAU3gWLKddYB.6pNo6J9xm2IOnJk87iqtdm9jPMKYOpoJt9_XtsXtpcwgOtQdc4K.sXp7_lJJ_hbpTpbRuhRbZvdU_mTKmSfW.ka5pQRVvbDBEIOSZj_IWZC8DqmbMvimBzTqY1jvHW26ta3rXpM.qbeRgz1iSqDDWYPDqv6.pl3tWXlCStbWxnOLAYPXAmnPEeI1XfhlG69vB5cMmn.euCa2rCFoFwpiipZjxwW_caMgtyt.JX_F90DKPIyX_LgckTzwBnu9oetKel_ks.rJovp1B7SGGnU_qKnKaDbJsKnsIEM4kvNbQt3XVuiw0a8VIZCsZ_bulHNvMNGQ_RF8HNWQ4LMkwydW5fYCBOVjFM6H52B31h7.yZiHzNkO9ZY1DzAnJBa8uJAlWQmRU.AvwwPtKS92ovXVkgTYiToQVVW.VbsTrq4jZEqdSvWIQgMiRMb9SSAq5YZOe3aMEeHbujEraIEziI8D2O7ZibmNG9ipL1Nmp6WHySnA99UujJTYartVBfVEmcChcOORNCblD9QDD_7abcHkLf4qMm1EBgglQCuMINmTvpXMA6KgUWn6pAdsZElHbGxjT_pWmql.pddFxM2meVuGF.4oykdFCqUlrjpUQ4KlfoGw_neFT80vugyK46WFtOCIeSXQk6sAmBtcDd0xsufVS2HiK_PjfYKwFsV52G6mQA7ZhQ4uwbH04WfQLpRw16EThgGze8w0PYnqvsyAu87BWJsiaxBbpxCXqx.8jbZOPveyApnEIM0cETaEhnn3zn3Z3SiX3kNAwd85cleZv5QznpykO0KDyfo4hY033ujvYoO5eXQK22s6kNdkts.GmerGsq4jP_bMcihdObm.2XV8QRQYtZl62Z5soA5Aoi76IGysv5k4yglCOl0J28ES_hsiP6mGnxQEAb1ZSQDWWUesginUmgYJiIDtvcOhReeFPuOkdPA9vGIF6bW00yiVgrFFrpOYg5nI.RVPfZ7YTkRkfqAjdnpluT0NyFxwBxJSwfcVQojYwunp67E03Y3nS4hyR3haSMD56BWapfrGW_8YXJMvOL0rAZ1Ng2KrjjmIcNQL81TIySTHGQ80TGgLRBbhsr7BT0j8sTR41QZMOeHZv3p1hBehqkoThizr7wKsJWST0wP9caOfEXn7ca31IrNPSoPWV4clJI1CjjEn1IQdRJJy6TC4etomgmAZ_GZcjagrVcxIah5lQdpE88jMWaQM3AtmnVZCV0FxjOmclfcJv.GxJ.X5qT3D0lCAnV6JRTMXeQ8icOp4.QSbodO0Ht77GjSH588DReaz3eLldf.YSqGPlIJ.76w13zASBTgjD64gNEY3z7cKRVxz6i8NFmiVsQf7uNP.kqFpKPkc.YMyBvQqwv0hfOKookVzfadjYcgYR1q5tJzbMisll4Hkx0eCkDDEZghiovTyfosLLOXoMwykkR0dioDInyLl.qCMIw4Lq5qyEK1Aguyv..LoeAKMc4hzi1JhEJkw5a_TWDfGd4vwxr6bbxn_hLWyv7k7VnclhOEH6BLiYG1JeYtGsNiOKWYcluraGcbspV24qxJP8kOjq5wWZtOOl7Wgt9toiaxREPl89PDL9w9pDjTAM9ZXYsKjLucsMROXcEdkFtpPEBFecVd.iLv9MTZb3V7toybcaadWhIYOH_0.2154wGa67XH.Il5u0kR1pQr2dsydKcx20kJ9pLMI.Ln7W9t61poW9BjzMRnnB6CSLOZN8pyraY5W.xeEJlvHiq7KPctfrJvO4wZVXjeNYQ97ZBrVhenXevDRKuai_sFq_N2Fy_Xs4SjZJOqTVGccj5G_vWGiysZ4eiUDwlW7uBWUZfl4AjV4bkD8rC2uGyQ6tz.9jzjQfcKbmLE6QMFSZyI4cjJK5MEnn6Cxuf2_9romV_AcaEZJkM6mdPoEjax6CZF_HL0vjA8RdcMhi0bh6j43cPwdkW2hAH23dEMfw_BD3kAfOAXeBa2nJX8tKaw6I1KtaBfRBzSXatsC5rjKttb0auBfVyL9ud0rL3D8L7wJrCp4gtEEQLxNzdos_0SkZMYcnz78N2JpCPEXohTUxJpcP0fs3ZXPE2B7EWc9RVh34wRHm2EpYZVXm1TVweNmSKZIa9JqMzMlyx5QQi4lgR2YGhsnf_GDbjuGoh4JocteMeITaP4eHtvViAh_TgHCpuingQXe12FJL_TooeaBTTlLq8fPGAaDG_d.CDFkfmOg",mdrd: "CsityqTqQz_Z0k1Ehz4fKhPLoviKVN5mpDHRVU0I664-1739219438-1.2.1.1-Un9_wxy71i3JADJ1ku1rUhdr5sHSSo6ah1L17imrV0uglpizijnzNxxVcWtsAe15FyOaEC1trTpl.RVu8qNA99fmxxmW8YyyhUeEd0x35n4DIY9ivK7tJvgZLN8hD49TMHb9mAGIOqZVPTWwrfIUBZwOOhrDul8_WJzjuzTozFpHgnkQOgh0N4Yto5_Yq2mFUe1Z4JSIcgEbl5KQQqHnq1s_6Pw83uX3ErNa98j..7EWTZ4256wP9Ipn69EHhyslypsYRDC9GyuBQzIAsiobyhdmLSs8HpLU.kq7f4u8w4caP6Wb8Nc2IouZFpEo3avLr4cQAhLp8V54jECgc5rENkbPHuNlbLgxcxwp9yCUzzpuysMU0.YL8xdPYjWGUJP6qsHGk6HhOJ.oZ4eAu3yNqjhV.FLmnM4DmUk.3CAr4f4DMUWJWnH17iEWttSUcHbDfCDKxrmBxjT02LmIJScA.19kK5up8Ait4l0hBDX194yfxSw9BgxDq5HmJE9omEU4FLIsYRDZ.gbnJyDy6w18c_XeloW6phAT1QbMQYpzXQuBqyqNP4Tn3LL9UzDQCOMRl9sEZkuSumAHmH7i2G4lm_r4VME9MZFNi_j5SIdX6HUjs88OvCrQWjMNN9NrvZNTOYS_xhTrgQXhFm2QVFbQu0xMRfUc3qrPmxVEvWzIdPgCqMqshNZoHibbTNqx6GV3rqp5bFb6owWHmGKEuwElpn.sC9rMeheGELO8b3gBLg5wi3k26NByUpjd7de7LqXI4VYagQH_AJBpyXdwDAThEnLAEhwotUfT0lOWlyRdzNtXGwpNMMYtsuVUTET1XvG.gM3YnHlWW75Ycm80q_7akiohfN_jHI2HCa7sRYmr7u8Cyzl8NMVYPIbbGxWOewU0_mS_MmUZ1.Pc6t3CuGEbcL77GEiA_7_J46cnY.DH5zJDuwmShR28YDOh9ssr9d8SGIh6r29HtFEAYzdJcNV97rzU_H2Hq.fqCOt_GPdD20Bj89iAuFWuNwE314NBgN7yfIDI5hZ8vF8Mr72QizFTq7aHqJQW1o4OCPmjK9dud.edPRjUHJ77r5fluJWs8F29vg3G8TASGuIybFb9ynkTs27kBXS6xoKIEM.DUF4pen9ZJrkksi2jPLVL6pzsdt_RxCOfomUu..NVmBBZ_GVccVFu4dQ8OB338vhbbrziimPMKeZ6A14G3VyFZ9o2A3lqTPbLj_euPQ05.1wBMCqg.tWP6jJHps90cAo26RIB2PkYe8g5dZ6SY9IHQmDQFWnkkSDyBRGXqTKkfPkPFmPCsBPCHZtjXxhbwBoEOywtH9ciTVOGUNYP3g22sOft0vELuUAEafSG74vJnp9v.TpB3f90D6Z7D7I6h1jmn6ZKWBZ_B_0kDvUNzuN.P_v29OVYKLu37NCSJuutOMdf7MLFmBsnOvtI5vXlExU.UTXmF0rocgHRp3MuVvgQr4hlNHo9OYQERpIhmj5zeCRAjjzy4KpCc02YIGRZc0hgusk9w01sGa57rzUrRjBH53_4u8FqZgvSmhNZQK400dfry8VESiIhlUjG_UB0C8CbDeOJ9M9vMhdd2SRU2UnZc1rPE.DdNwWR.uDnMI1e.bXJf73g1gB2HgsvvHG.GSd6iZe8cmDJvb0xn5ucZ3TKYSPC1EChtS4KPg3gpO_iN6Bwts3IVC3y8wjeoLOJvdfI27ibm5DSGpcWdWEwnNL2wY65SNgkObEevNWimePfAM4hjidajW7eOMWkIApT6Qj1bjorNjlw7ziwtzUlQGAI1te4wgafErVVxX6O667Ipj5CYzOHMz8m.MqB04uC0AxryYBmhcK2owxK38wlxyfNYPXCK0ZQ"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=90fedbb26a4cff1d';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\/100851003754?__cf_chl_rt_tk=H4kcSo4.Y0JJFTY.iXNpd0FrS_eemDq8tydI906sP_E-1739219438-1.0.1.1-06XWgFFzbBclYeifiHMe6KB0o2LPGb0uwhV41h6XO64" + 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