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“Humanity is on the verge of a weighty achievement. On Friday, representatives of more than 60 nations will convene in Versailles, France, to approve a new definition for the kilogram.
Since the 19th century, scientists have based their definition of the fundamental unit of mass on a physical object — a shining platinum iridium cylinder stored in a locked vault in the bowels of the International Bureau of Weights and Measures (BIPM) in Sevres, France. A kilogram was equal to the heft of this aging hunk of metal, and the cylinder, by definition, weighed exactly a kilogram. If the cylinder changed, even a little bit, then the entire global system of measurement had to change, too.
With Friday’s vote, scientists will redefine the kilogram for the 21st century by tying it to a fundamental feature of the universe — a small, strange figure from quantum physics known as Planck’s constant, which describes the smallest possible unit of energy.
Thanks to Albert Einstein’s revelation that energy and mass are related, determining exactly how much energy is in that unit can let scientists define mass in terms of Planck’s constant — a value that should hold up across space and time — rather than relying on an inconstant metal cylinder. (Mass determines something’s weight, and for most purposes mass and weight are interchangeable.)”
JJ Editor's Daily Picks
"The biggest topic in British political circles on Monday wasn’t the country’s impending departure from the European Union. It was milkshakes..."
"I often disagree with Rep. Justin Amash, R-Mich., but I've been disturbed by the idea that he should be run out of the Republican Party just because he believes President Trump committed impeachable offenses."
"The Icelandic band Hatari, whose members are quite vocal in their animosity towards Israel, held up Palestinian flags... Madonna, likewise, had two of her performers wear Israeli and Palestinian flags on their costumes."
"To celebrate the 10-year anniversary of Quentin Tarantino's "Inglourious Basterds" premiering at the Cannes Film Festival, I turn to movie critic Roger Ebert's old review of "Raiders of the Lost Ark." (Trust me on this one.)"
"The money is already here—and has been for years. In the midst of a housing crisis, an injection of cash into the superheated real-estate market seems likely to cause an uptick in evictions and displacement."
"Parents concerned about YouTube debate whether to let their children have their own channels; some forbid it, others send them to summer camp..."
"‘I Had Completely Lost the Knack for Staying Alive..." Warmer weather brings daffodils, rhubarb at the farmer’s market — and, for some, despair."
"With his new book, Howard Stern proves that his rightful place is among the prophets and moral visionaries, not the ‘shock jocks’"
"I’m terrified of parenting in the anti-vaxxer age: Anti-vaccine propaganda isn’t just harmful to children. It threatens to erode our entire sense of community."
"...doctors are starting to think more about specific nutrients that feed tumor cells. That is, how what we eat affects how cancers grow..."
"...it represents an impressive achievement: a victory of humankind against the chaos that pervades the universe."
"If trends continue, in 20 years the majority of the world’s Jews will be living in Israel. The United States will see a continuing decline in overall numbers, with a growing observant Jewish population..."