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Measurement
Until the late 20th century, there wasn't a truly universal standard. Under our current definition, everyone agrees on what "one meter" is.
What are dark matter and dark energy? The large-scale structure of the cosmos encodes them both, with ESA's Euclid mission leading the way.
CERN scientists achieved record-breaking accuracy in mapping the mass of a key particle in the Standard Model.
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Testing is an attempt to measure intelligence. But is intelligence really what’s getting measured? A neuroscientist weighs in:
Even if you aren't in the path of totality, you can still use the solar eclipse to measure how long it takes the Moon to orbit Earth.
Our greatest tool for exploring the world inside atoms and molecules, and specifically electron transitions, just won 2023's Nobel Prize.
The double-slit experiment, hundreds of years after it was first performed, still holds the key mystery at the heart of quantum physics.
Every timekeeping device works via a version of a pendulum — even the atomic clocks that are accurate to nanoseconds.
Something isn’t adding up, but it isn’t a calibration error. It’s been nearly 100 years since we discovered that the Universe was expanding. Ever since, the scientists who study the […]
The act of observing doesn’t just determine a previously indeterminate state, but can destroy information, too. Imagine that you’re a scientist attempting to understand reality at a fundamental level. How […]
If we want our conclusions to be meaningful, our data had better be robust. When it comes to the Universe, there’s a whole lot that doesn’t add up. All the matter […]
And if you have a friend at the same longitude, you can even measure its circumference. This year’s equinox, on March 19/20 of 2020 (longitude-dependent), is Earth’s earliest in 124 […]
It’s been over 100 years since Einstein, and over 300 since Newton. We’ve still got a long way to go. From measuring how objects fall on Earth to observing the motion […]
Every physical theory has constants in it. The gravitational constant is remarkably uncertain. When we first began formulating physical laws, we did so empirically: through experiments. Drop a ball off […]
Different measurements of the Universe’s rate of expansion give inconsistent results. But this simple solution could fix everything. In 1915, Einstein’s theory of General Relativity gave us a brand new […]
There are only two perfect numbers that fit on the calendar: 6 and 28, making June 28th Perfect Number Day. Find out what makes a number perfect, and why they matter. […]
And how if you try this with someone shorter than you are, you’ll find it extra convincing! “I drive from Florida to California all the time, and it’s flat to […]