Light bulbs can turn electricity into light (and a bit of heat) – an expert explains how they do it.
Give yourself time and you can see in the dark.
Just the tiniest bit of light can let you see in the 'dark.' Here's how your eyes do it.
French startup LightOn is currently on working on developing light-powered technologies.
Dmitriy Rybin / Shutterstock
Hardware could exploit the properties of scattered light so that computations happen at high speed and with low power consumption.
Pulses of light followed by extended dark periods might help make indoor agricultural production more sustainable.
Indoor plant factories have high energy costs since LEDs replace the sunlight outdoor plants get for free. Scientists found a way to dial back how much light is needed by breaking it into tiny bursts.
Gravity helps stars to form.
UNIMAP / L. Piazzo, La Sapienza – Università di Roma; E. Schisano / G. Li Causi, IAPS/INAF, Italy
Gravity exists because the universe is full of 'stuff' – here's how it came to be.
The crests (bright) and troughs (dark) of waves spread out after they were produced. The picture applies to both light and sound waves.
Most people are familiar with lasers. But what about a laser made with sound rather than light? A couple of physicists have now created one that they plan to use for measuring imperceivable forces.
The sea is blue because of the way water absorbs light, the way particles in the water scatter light, and also because some of the blue light from the sky is reflected.
Photons stream from the sun and interact with all matter on Earth. Depending on what the light touches, some of the photons will get absorbed or soaked up. And some will bounce back.
A cross section of a fractal pattern, created by a laser in the Wits Structured Light Laboratory.
Nature can produce fractals, computers can, too. Could light be a fractal? The answer is yes.
Lighting causes damage to paintings over time.
Juan Di Nella/Unsplash
Researchers have found a way to reduce light damage to artworks by up to 47% by optimising LEDs to prevent light from being absorbed by the artwork.
Is this it?
Everything you can touch is made of molecules – but feelings, sound and light are something different.
We don’t all see the same.
What colours we see depends not just on how things are in the world around us, but also on what happens in our eyes and our brains.
Hanukkah demands fewer religious rituals than most other Jewish observances.
Golden Pixels LLC
Despite the primacy of Christmas in American culture, the visibility of Hanukkah in pop culture reminds Jews that they have their own holiday in which they can take pride.
Are bulb bans a bright idea?
Encouraging people to buy LED bulbs is not a long-term solution. We need lighting which is kind to the planet and our health.
Cloud Gate, 2004. Stainless steel, 1,006 x 2,012 x 1,280 cm.
Anish Kapoor made “Cloud Gate”, a giant bean-shaped mirror in Chicago. Visitors play with the light in the city and its surroundings, where our future lays.
What could a ‘relativistic camera’ capture on the way to Alpha Centauri?
An astronomer suggests an idea to piggyback on the ambitious Breakthrough Starshot project that aims to send nano spacecraft to Alpha Centauri at a major fraction of the speed of light.
Section of a tumor observed with an optical microscope. The two white forms with brown borders are blood vessels. Inside, gold nanoparticles accumulate against their walls.
Mariana Varna-Pannerec (ESPCI)
Gold can be used to make jewelry, but also to fight cancer. Several clinical trials are currently underway in the United States where patients are being treated with gold nanoparticles.
In 1954, three scientists observed a paradox to which they gave their name: the Fermi-Pasta-Ulam recurrence. Now, fibre optics are on the way to finally providing an explanation.
About a century ago, we didn’t even know that galaxies existed.
Mai Lam/The Conversation NY-BD-CC
Pretty much as soon as we understood what galaxies were, we realised they are all moving away from each other. And the ones that are further away are moving faster. In short, the universe is expanding.
It’s been 70 years of instant photography, thanks to Edwin Land, on the left.
Whether at a family gathering or in a research lab, getting access to images immediately was a game changer. And Land's innovations went far beyond the instant photo.
While some things glow all the time, glow-in-the-dark paint must be ‘told to glow’ - just like a phone needs to be charged or it won’t work.
Mai Lam/The Conversation NY-BD-CC
You can see glow-in-the dark paint, but if you touch it, it is just as cold as the bedroom wall. So the glowing of the paint is different to the glowing of a light bulb.