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-5486731209-gov.caltech-edu.pp.ua/post/4972650831

  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-5486731209-gov.caltech-edu.pp.ua",cType: 'managed',cRay: '90fe7eecaf3c580e',cH: 'Cg5KmJCchM3kfGMT.jyBV4Kzd1oyfvbLvKIIj05X2pU-1739215638-1.2.1.1-vd2aBg5oLAyrGViT5YP64nQ3KVXdhKPVptOtzlvZAOCNeczHlfcqhfwRUDCqNM57',cUPMDTk: "\/post\/4972650831?__cf_chl_tk=RcLeWidzuB_rJLABghbQuDdBGNZZ1Z.eWQR7fP1..gE-1739215638-1.0.1.1-CeQHfCu5JySMtgFUBlgKM.F59YHyPLGLJMo_g3ZM1X8",cFPWv: 'g',cITimeS: '1739215638',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/post\/4972650831?__cf_chl_f_tk=RcLeWidzuB_rJLABghbQuDdBGNZZ1Z.eWQR7fP1..gE-1739215638-1.0.1.1-CeQHfCu5JySMtgFUBlgKM.F59YHyPLGLJMo_g3ZM1X8",md: "huctwZABKvnPyvQIpWm3QeIsHsjLY4qazu3N71F6yec-1739215638-1.2.1.1-QlpiXypyKR4pwlQNtG9xaiCgw_I8AyMKDhg31iLSDF128XOPy09uwxn7w8Z8Y9qo6QRDN_sRHg5q8dA5aqzUz9L3uAHmpPCaqUdsCfZD8rEChyinv9EaNt2HMwj1IQ7lt2mqaEYTaqZQLvh0x2uZmvfo7ipGUeYYfowxZKdyCl1bRA73s6TBvbfF8thaXzCofril6yQkm8wqBAPYHYiYweQUiHB2rOitrdZ7CXRq02d3XoT.PLX5q_YUZsJsQYHxTNk2D1IptV32QLnZVu_AIxJAnynKiD.F_FE5qZfq2WOZKWHP5ejdw2yK6maEGETBc6xpZZRiGJRBl95uuG1DUdT1uzKjnhoM24ehT5Ux2VNd_4k.qFNQYkOR93pNrRCPOoEx2Qa8oiwtBamrBz2nAOb6ilB8rolj7tDv_u0L2FzmggdhoAstdy6LnCgmSgh_FxL3o.lhBw9w4ltLDwLeXydGhgcyuBqdkBpeVY9qL48agR0oLMRxMSYTdg6yyAsL6J.PotkCNk1FHuri9bl7eeE6rTZKi_M.OQp77thTVfid6zUz4Z08LoRCLXhL_yYlNQ1z6SW1LeYDe.slvA87Ab1_84yGNLTExQFEC8xHViwoWPl9oOBbPXPZ0X3BAeAZkqEiJoKypNdWh__ZPDttHeWPdFaMls5nshRDuOXyQyHj5aHq6ozDtBI4M1PcpYOEWo8VHo4ljuIH2e6tWsxqsBWsckfSFC00OKRvj9Fn9CcMUYtPJ1p5ONe6VSqv31n0H.DhDtlaGj6CQYpaQlPjz8IU1xlIMA6DE.whndaU3W9O.Cq_l0KZbdkEy0jhhfP6cpfoSePzIhjupOwfu3KUdU2qKf_bHcYU38IPEkVMKsHD3ySG3DY8B7xs9M4hOjWN3Fr6rWNHOgaxpnxEc8jF5UWGVsjLzDv3vQYNQ.XdRnP8vTqd8N3.GZWyfn4xoQ1qHiwFHZ8i7SxHgFpS2uNgRufV.2gsWT7dfNP8XcQu6ZebDt1jgt3x_VvoLsEKi5mgnVK7vh71vbpbVrGS1tW92DvRJ5e6_tolUCNuTzXZ9PylSUL5nv5OfecEkvdiPVlFPmA3T.eiEXCTdRkKc45uRYuoH9LNbbk5kJ4nbY4ryg.iNKpCk9MkTNuTUwiU2_qNV3XaGzUkGzvqpTOOBnW0ZhRRmF7ooHapePCqXLilwa8VkCmUvVzyXsrAPH2teZcPg7TuQK1hPeu9.k2rhj1cNXkNdfXO1NH0ss0UOIlseR5riQ56sOGvT7vqArrET7qWnTxeWVHqFtVN4mYKTE.yHtEGVzGS37aHyuA6BysBdAaQvVNGRA7jLbaCGm4vfq9WQk5wPFW__Z.G1lfHmcl..aKLnh_JS5Wu3d7k0dP33Ah9_RwT1D.VrXKh7O4ZGs6tmvu_3hNU27BOqf5RXYVWIixmDxmp2KhywUZ1up.KMiMEsMeM0i_Y1DLoWpCa6Mws0z03Sto.UOHO1SohBZub2VSW_9uWo92WyOZrSukb8cLGLGBapQfDh7Sh5r37xPcOv8CxHBjZFXWOh9qIm8askiga2sv6dTe25iXZb2PVGPFyys5ax3arUmN29RaEeeg0uPpBysVRfDh6d71KWtuMrrHasn.NUgcwUMKjjoXj9_6rqW5wtagRCV7rj.FoILTid9YhgoyJLay15jIZ6lIERbMlSIlizzEglXRLnNBOHayIpcjRpfBAVBZ612zEV11DITGEuWP7JQsMUqhBob3LyLCsWcaKO64d9D2bvSoMglRzYvGvWgB1OxMbsAVqTuOEazhbLT25ivM4hDGjPG8mnof4G9oarmEuO.jcVgj8fKr5pho1Vol.FTwBX0Xyzi3Z5GE4gmxsPRpTDsKsYi4vooyjDzNZBuOggc5g5C0fFrwiieouB5auR3j21J4X8jXuuwrgECzh4UfbAdkp2JQ4vDfRnTGSU_edR5wSWWwdRU61QUy18tmMcgH4DzdEPcGsR5ula0LPu51MvmLZAux2oUJhjoPslU7waUMer265IGMWibmvr8GTYgyX07nyqBHWrsF2WFYmOVcdDl.LMzfuTkB.nffdtmumg88wEJJv74rKWjHZggQF5XdT_rTxvMGDj9zDqmD1Cwtp8Yjo0YYH_Qns1izXj0WKoT_Xj_nN1OVV3rLAhfMUWFrtZyqHQ.Rzvv4N7amv3qcaFh7PrGMM5XshbMnxepokJK3Z.kLikQ4JZ97dETC0Frekag4alSGM.E_BOwjRF45xarzwtz0HRA",mdrd: "OCsbR9LnL.2GL6gMVdCMEgglZsKWJDnjtMN2wu6mj_8-1739215638-1.2.1.1-qV3hxkr5.Xxv226ocnUwq8wzVrHC3JwHkSZxnwr5YzazCE5WRmIEKLKmqwAaX3lnSjmotps2h8ZQ3Ytrcpo2g4CRe3Xj3sCGBvbdRRxP86z.aJpCYitGPduDmTJSXmv334Ra8cKw9_a6hZWr_0zkbjjo0v65JLK2osu99Ha8BmGb0BBUZPjC6IPLs8w5nVKfczZoK.f6cXoTTarh.opKDRZG4OG4UfNDYuXwNCY1nTtmkjFvAQeQrsbx_Nnw3yPW4SmPVbVS9YGtdhqJlxfMuSPWzARCJYhRSjnFfoWkM6CXetCbGvDM_T1M8BCk3.f11CUBeSLQ4qIHFJwtU6d6uhKbbC3hKAKTNXGFvC96bF23.cgUG4tSnRU1CcAMJQetwNMzDiMqSVJM3DBKWqPb5_XAfA2EdCaUjbCC8OPDCM_X.7rrE0N36gFqf6P3Eb742mqRS55zIQVZnj5OU5Zye611b1PS3JNZ4knnGk11xMQsB9J0GvY9AtT4PqT3cFJt8sA1KKAuwnNB9t1Os.QOTqTFsBKReGMKJnvskVgEUD6._6TbrxIVeVWGO3CkwKqpDO.tuxtkh.SFH2DMbxyU3FDoqubbktmbKF8lLfHSUtG4MEedH4hJ1utRo4xQLJb5yaXxAp8WjZAyN0CDWuHZMzj7.jTmd9KULEAE3ASP2OwSXdxSB4GfsiMGqzxf4wfBL0id2sRxqyfTGpL0R_OadFOCtvGZJlS1AmwafmiysNpcpIJseTJMr849NqPk_DjYCKTmuLtOdTkWFHF8eovV9vhYBdfqK9.EJp6wy9HZ10xNEdkY1xkOZqrQbmi2XgPr75xn7NwnrlQsknYfTV87Ep8mS.hLsk_MxthL.MFlJ2hW8v2CcL_vb3rLby3d7wHH62KhdB4sSqQzjPaxNukdSh0fMRAbxSqhStDIYcEPhEf1xRTmG_ZxXQyTzNwnXz9GkJBX00H7PeE5EVi9a6WzRvJ.ELn2l0R4NFCdvvLZeI0mD05yEDDGxt4LyZvlTU9ez1u.kTbUoBeywvbiM.4DFC32zyiWO89B2I4zlcrxAKnxodX811QHzRzespQ1fzR0Km_PBx3kSrMsKzhMoaMmqpbYqJiZoj2B74RkHHIZ4yLr70.VztYWdUj.y7Ghold22oRi48zN_kroLw_fCL_.OTtbmbBwKwamzhT6wUbLo96CpbUf8CW2FKMs10cg6O23W1USI90Ns7IcvboHBubZWrmEvzLvIsNbi1sciTCOMpiwyo.FtjEuTEI9k81zWLmYhW2OLIJkjwCLEHmI4kLJa.D0FxfHxPEbau6P5.LsYJu_H.U7BXDYxCBozJ0ofPI66gmEFbeT08hiJwpsJehHfxGEKNNDNQtzKSoCAfDA9SJnBTgDvvVkxVRJh9WnVqOUTh4qn3_gHq2mE0O__XrVwO1.ihAoHitMBzMhQJAg4KKSStg.3p5xGwLr1IHAOEKmZSgJZlASy2PM.8ayS3L85VmM2CMhRCwOKS5VTnJ5rSYeZs355aGyVJfqPyBQgey8M.0QBDPDw_8G_b0wLmIMY9s_IyUbshjDBVMXEwLthOqRlq9C.y6eu6kUkbH785_FT3OUB3RUh0LS1J33I.QwnSz.NKL0orYBPVSlGcKnlYKEiuZFn.UJ3r66OyxBUzn1QvJ4r8fUfAViCtD8o0bnuYZU9aRxKcgEylkrEc_L3esH97W0y7.VN.uRgeQ3S4g74XQcJVkEf4_WRxm3l8cRKIsiAN7zU3fm9XElq9NkaD8SKWiTx1DKPJrN9wx7r1.8LKvDUgEzK3r0XIMSSIsvCQuoqEudFyzkoAfs7D_x6oHg0Nko4lXNbB4aOKQCFlEb"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=90fe7eecaf3c580e';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\/4972650831?__cf_chl_rt_tk=RcLeWidzuB_rJLABghbQuDdBGNZZ1Z.eWQR7fP1..gE-1739215638-1.0.1.1-CeQHfCu5JySMtgFUBlgKM.F59YHyPLGLJMo_g3ZM1X8" + 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