This Halloween, scientists celebrate a cosmic riddle of mysterious material known as “dark matter” they believe makes up most of the universe.

Tobacco’s stigma has a new rival — air pollution — as the World Health Organization called attention to 7 million deaths a year from simply breathing.

The Universal Postal Union said it has begun taking steps to fix the shipping policies that the Trump administration said undercut American businesses.

A small protest in the Swiss capital brought into sharper focus growing concerns over global weapons sales and the murder of Jamal Khashoggi.

Turkey’s president said an international treaty half a century old will help investigators unravel the carefully orchestrated killing of Jamal Khashoggi.

Corruption erodes governance. But the fight against it can bring unintended consequences. Both were dark themes an anti-corruption conference explored.

U.S. President Donald Trump announced plans to withdraw the United States from the INF Treaty of 1987, a move that could risk a new nuclear arms race.

Demands for a U.N.-led investigation into Jamal Khashoggi’s murder widened to international organizations that promote press freedom and human rights.

The U.N. human rights chief said the likely murder of Jamal Khashoggi would be a serious crime that should make Saudi Arabia and Turkey cooperate fully.

International aid prevented 669 million deaths between 1990 and 2016 by spreading access to health services, but the gains could vanish if donors dry up.

For two decades, the space station has been a hub for living and experimenting — and example of how science can help nations rise above political rivalries.

Nikki Haley will resign her post as U.S. envoy to the U.N. at the end of 2018, U.S. President Donald Trump announced without explaining why.

The Nobel Prize-winning U.N. panel on climate change said it’s life or death for much of the planet as soon as 2040.

Interpol said its missing president Meng Hongwei turned up and submitted his resignation while in detention by China’s ruling Communist Party.

Interpol, the world’s largest international police organization, has a mystery to solve: its own president has gone missing.

Nine nations and the E.U. signed a treaty to delay widespread Arctic commercial fishing so scientists can study how it might affect marine life.

The U.N.’s highest court ordered the United States to lift some economic sanctions against Iran. Hours later, the U.S. cancelled a U.S.-Iran treaty.

The E.U. joined a global treaty overseen by WIPO that greatly expands the availability of books in a format that visually impaired people can use.

An independent review found nearly half of the U.N.’s staff saw misconduct or wrongdoing in the past five years, but most were too afraid to report it.