Continent of stability (Part 2)
Beyond the boundaries of the natural elements may lie a whole new form of matter without protons or neutrons: quark matter. [2 of 2]
Category: Physics & chemistry
Continent of stability (Part 1)
Nuclear physicists predict an “island of stability” beyond the current end of the periodic table. But there’s another possibility even further out: an exotic “continent of stability.” [1 of 2]
Viking sunstone
The Vikings navigated by the position of the sun. But what did they do when it was cloudy?
The scientists of Mars
When asked why we have no proof of extraterrestrial life, the Hungarian physicist Leo Szilard joked that Martians were already among us… they just called themselves Hungarians.
Sludge of the universe
Many moons, dwarf planets, comets, and trans-Neptunian objects are covered in a kind of complex chemical sludge sometimes called “tholins.” And this sludge may be much more common throughout the universe.
Da Vinci’s fractal trees
Leonardo da Vinci observed that tree branches together are always as thick as the trunk beneath them. This is true, and there are some good ideas why.
Science wars: Non-periodic crystals
Up until 1982, all crystals were believed to be, by definition, periodic. But then an Israeli materials scientist discovered something strange…
Rolling uphill
The mechanical paradox is a device that seemingly defies the law of gravity: a pair of cones that roll uphill.
Sky compass
Bees use sunlight polarisation patterns to navigate. We can train ourselves to detect light polarisation too.
Natural units (Part 2)
Whereas most units of measurement are arbitrary and human, Planck units are based only on four fundamental physical constants. [2 of 2]
Natural units (Part 1)
Most units of measurement are based on specific physical qualities or tangible reference objects. But they don’t have to be. [1 of 2]
The shadow of the volcano
What do the bicycle, Marmite, Mormonism, and Frankenstein have in common? A volcano in Indonesia.
Glowing snails
Just one species of land snail and a few species of freshwater snail glow in the dark.
Fire Diamond 4-4-4
The Fire Diamond categorises hazardous substances according to flammability, instability, and danger to human health. One material ranks the maximum on all three scales.
Underwater ball sports
If you’re playing underwater rugby or football, how do you keep the ball from floating or sinking?
Doomsday device
In 1950 Leo Szilard warned the world that a single device capable of annihilating all life on Earth was theoretically possible.