In 1869, Dmitri Mendeleev delivered a full paper to the Russian Chemical Society spelling out the most significant aspect of his system: that characteristics of the elements recur at a periodic interval as a function of their atomic weight. This was the first iteration of the periodic law.
Videos

FO Talks: Make Sense of Donald Trump’s New Peace Deal With Iran

FO Talks: Make Sense of Qatar’s Situation in the US/Israel–Iran War

FO Talks: Andy Burnham — Britain’s New Captain in Tumultuous Times

FO Live: Antisemitism Is Rising Again — Why and Why Now?

FO Talks: What the Domestic Situation in Iran Tells Us About the War

FO Exclusive: Keir Starmer Falls to the King of the North

FO Exclusive: Iran Trumps Trump in New Art of the Deal

FO Exclusive: Global Lightning Roundup of June 2026

FO Explainers: Xenophobic Attacks in South Africa

FO Talks: North Korea — Unveiling the Hidden Truth

FO Talks: India’s Reckoning — Reform or Regression?

FO Talks: Who Owns the Ocean? The Hidden Law That Rules the Ocean

FO Talks: Why Is France Deepening Ties With Kenya After Fleeing West Africa?

FO Talks: Armenia Election — Can Nikol Pashinyan Win Another Term Despite Geopolitical Churn?

FO Live: US Surrenders to Iran, Leaving Israel in the Dark

FO Talks: Has the Trump Administration Abandoned Ukraine Due to the Iran War?

FO Talks: Why Are Europe and Canada Pivoting Away From the US?

FO Talks: Iran Won, the US and Israel Lost

FO Talks: Prime Minister Abiy Ahmed Looks to Secure a Landslide Win in Ethiopia’s Election



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