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31.
A total solar eclipse is only possible because of a cosmic coincidence: the Moon is about 400 times smaller than the Sun but also about 400 times closer, making the two look almost the same size from Earth. But the Moon is slowly drifting away, so this alignment will not last forever. One day, hundreds of millions of years from now, the last total solar eclipse will pass across the planet, and no one will ever see the Moon fully cover the Sun again.
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▲ 0 · May 31
32.
The Moon looks white in the night sky, but its surface is closer in color to a worn asphalt road — and it appears bright enough to read by on a clear night not because the surface is bright, but because the Moon is so close and fully sunlit that even a surface reflecting just 12 percent of incoming light becomes one of the brightest objects in the sky
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▲ 0 · May 31
33.
When Zhang Chenxing, who holds a PhD from MIT, co-founded Mega Engine Technology in Xi’an in early 2024, China’s high-pressure oxygen-rich staged-combustion know-how sat almost entirely inside state propulsion houses — and by May 2026 his startup had logged 1,000 seconds of accumulated test time on a closed-cycle kerolox engine
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▲ 0 · May 31
34.
The leading explanation for how the Moon was born is that a world the size of Mars called Theia slammed into the young Earth and flung out the debris that became the Moon, and recent research suggests Theia itself never fully left, with two continent-sized blobs buried near our planet’s core possibly being the last remains of the world that struck us.
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▲ 0 · May 31
35.
Earth’s magnetic field has flipped hundreds of times, swapping magnetic north and south in a switch locked into ancient rock, and it happens on no fixed schedule, yet nothing in the record suggests a single flip ever wiped out life.
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▲ 0 · May 31
36.
Zealandia, the submerged continent geologists confirmed in 2017, is 94 percent underwater and stretches nearly two million square miles beneath the South Pacific, yet its modern name was quietly proposed by geophysicist Bruce Luyendyk in 1995
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▲ 0 · May 31
37.
New Zealand and New Caledonia are the only large fragments of Zealandia still poking above the ocean, meaning the country most travellers think of as a pair of islands is actually the exposed mountain peaks of a continent five times their size.
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▲ 0 · May 31
38.
A rainbow is not actually located in any specific place in the sky — every person watching the same rainbow is seeing a slightly different one, formed by different raindrops, and if two people stood next to each other looking at the same rainbow, the rainbows they are seeing would be technically different, with no two viewers in the world ever sharing the exact same rainbow
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▲ 0 · May 31
39.
A team led by Nick Mortimer at GNS Science in New Zealand spent two decades mapping the basalt and granite floor of the Tasman region before formally naming Zealandia in a 2017 paper, ending more than a century of arguments about whether a submerged landmass could still count as a continent.
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▲ 0 · May 31
40.
The Moon is stealing time from the Earth, and it has been getting away with it for billions of years. Our planet spins so much slower than it once did that a single day has stretched from just 19 hours to the 24 we live by, and the Moon is still creeping away from us right now.
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▲ 0 · May 31
41.
There are more trees on Earth than stars in the Milky Way. A major global estimate put the planet’s tree count at about three trillion, while NASA gives the Milky Way’s star count as roughly 100 to 400 billion.
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▲ 0 · May 31
42.
The bootprints left by the Apollo astronauts will still be sitting on the Moon a million years from now, because there is no wind and no rain to wear them away.
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▲ 0 · May 31
43.
Tyrannosaurus rex lived so much closer in time to the first humans than it did to Stegosaurus that the gap separating the two most famous dinosaurs is actually wider than the gap between T. rex and us.
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▲ 0 · May 31
44.
Venus spins so slowly that one rotation takes longer than its entire year. A Venusian day is about 243 Earth days, while a Venusian year lasts about 225 — and because the planet rotates backwards compared with Earth and most other planets, the Sun would rise in the west and set in the east.
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▲ 0 · May 30
45.
The 1518 dancing plague of Strasbourg began when Frau Troffea stepped into the street and danced without stopping, drew as many as 400 townspeople into the mania, and later chronicles claimed some died before it ended on its own
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▲ 0 · May 30
46.
The Overtoun Bridge in Scotland has seen hundreds of dogs leap from the same parapet since the 1950s, often on clear days from the right side, and one behavioural investigation pointed to the scent of mink below
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▲ 0 · May 30
47.
A single bolt of lightning can heat the air around it to roughly five times the temperature of the surface of the Sun, and it is the violent expansion of that superheated air that creates the crack of thunder.
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▲ 0 · May 30
48.
The 1965 space pen myth: NASA didn’t spend millions to build a pen and the Soviets didn’t outsmart anyone with a pencil. Inventor Paul C. Fisher quietly developed the pressurised pen on his own dime and only sold it to NASA.
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▲ 0 · May 30
49.
Almost every atom in your body heavier than hydrogen was forged inside stars that died long before the Sun was born, which means the iron in your blood and the calcium in your bones are quite literally the remains of dead stars
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▲ 0 · May 30
50.
If you dropped Mount Everest into the deepest point of the ocean, its peak would still sit more than two kilometres beneath the surface, because the Mariana Trench plunges far deeper than the mountain stands tall
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▲ 0 · May 30
51.
The oxygen in Earth’s atmosphere is essential to almost every animal alive today — but when it first started accumulating in the air roughly 2.4 billion years ago, it triggered the most lethal pollution event in the planet’s history, wiping out the vast majority of species alive at the time, in what biologists now call the Great Oxidation Event
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▲ 0 · May 30
52.
The famous claim about archaeologists finding still-edible 3,000-year-old honey in Egyptian tombs is mostly folklore — but the underlying chemistry that makes honey nearly immortal in a sealed jar is real, well-documented, and perhaps even stranger than the myth
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▲ 0 · May 30
53.
There are more atoms in a single glass of water than there are glasses of water in all the world’s oceans combined — and if you marked every atom in one glass, dumped it into the sea, and waited for the oceans to mix completely, every glass of water on Earth would contain several thousand of those marked atoms
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▲ 0 · May 30
54.
The rock formations in the Scottish Highlands and western Newfoundland match each other almost exactly — because the two were part of the same mountain range hundreds of millions of years ago, before the Atlantic Ocean opened and split them across what is now an entire ocean
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▲ 0 · May 30
55.
Saturn is so light for its size that if you could find an ocean large enough, the entire planet would float, because its average density is lower than that of water.
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▲ 0 · May 30
56.
Thought of the day from Stoic philosopher Seneca: “We suffer more often in imagination than in reality.”
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▲ 0 · May 30
57.
In the 1960s an MIT scientist built ELIZA, a simple program that did little more than rephrase your words back as questions, and he was so unsettled when his own secretary asked him to leave the room so she could confide in it privately that he spent the rest of his life warning people against trusting machines with their feelings.
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▲ 0 · May 30
58.
The longest-running laboratory experiment in the world began at the University of Queensland in 1927, a funnel of pitch that drips roughly once a decade, and in nearly a century no human has ever actually witnessed a drop fall
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▲ 0 · May 30
59.
Sharks have been swimming in Earth’s oceans for roughly 450 million years — which means they predate the first tree by about 65 million years, and when sharks first appeared, the only plants on land were mosses and liverworts no taller than a few centimetres
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▲ 0 · May 30
60.
The Sun might look yellow, but seen from space without an atmosphere filtering its light, the sun is actually white — and the yellow color we see from Earth is the result of our atmosphere scattering blue wavelengths away, in the same physics that makes the sky appear blue
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▲ 0 · May 30