Physicists believe most of the matter in the universe is made up of an invisible substance that we only know about by its indirect effects on the stars and galaxies we can see. But the nature of dark matter is a longstanding puzzle.
If life emerged once, why not more times?
South Africa has 12 official languages. The two most dominant are isiZulu and isiXhosa. While the Zulu and Xhosa people share a rich common history, they have also found themselves engaged in ethnic conflict and division, notably during urban wars between 1990 and 1994. A new book, Divided by the Word, examines this history – and how colonisers and African interpreters created the two distinct languages, entrenched by apartheid education.
In the election of 1920, Eugene V. Debs, the Socialist Party presidential candidate, polled nearly a million votes without ever hitting the campaign trail. Debs was behind bars in the federal penitentiary in Atlanta, Georgia, serving a 10-year sentence for sedition. It was a not a bum rap. Debs had defiantly disobeyed a law he deemed unjust, the Sedition Act of 1918.
Hemedti’s career is an object lesson in political entrepreneurship by a specialist in violence. His conduct and (as of now) impunity are the surest indicator that politics of the mercenary kind that have long defined the Sudanese periphery, have been brought home to the capital city.
Since 2005, “stand your ground” laws have spread to around 30 states, transforming the legal landscape. Enacted in the context of deep racial biases, they encourage armed citizens to use deadly force against any perceived threat – real or imagined.
The microbiome’s signals regulate the growth and function of energy-producing mitochondria across many cell types. The ultraprocessed foods that make up an increasing fraction of American diets can disrupt these signals.
Despite the significant societal changes that have occurred in the last 150 years, sexist and racist narratives are still common in science, medicine and education.
Even though storm prediction is improving, tornadoes are still hard to predict, with a warning typically of only about 10 to 15 minutes. This is why tornado prediction is hard, and what's being done to improve it.
Reinstituted rules in the U.S. House of Representatives allow members to fire federal staffers and cut programs.
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