LED Eyes for a Mask Tutorial by  ohaple

View the full tutorial here:


Finally got around to making my casting video, outlining how I made the molds and cast the bow arms for my latest cosplay (which in turn is very similar to how I made Valeera’s daggers.) I tried to include as much as possible to make it easy to follow, but if you have any questions, feel free to ask.


Dutch artist and designer Daan Roosegaarde and his Studio Roosegaarde brought the Aurora Borealis to the Netherlands with an awesome installation entitled Waterlicht. Created for the Dutch Water Board using the latest LED technology, Waterlicht covered 4 acres of land along the river Ijssel, utilizing the river’s flood control channels, with lines of blue light undulating like the Northern Lights, transforming the land into a dreamscape meant to raise awareness about “the power and poetry of water.”

When walking along the river’s dike (walls used to regulate water levels), luminous lines are perceived as high water. Once in the flood channel, visitors become immersed in an underwater expanse. ‘In ‘Waterlight’ people experience what the Netherlands would look like without their dikes’ says Hein Pieper, chairman of Water Board Rhine and Ijssel. ‘Awareness is crucial, because the Dutch (water) artworks need every day maintenance and our national water awareness is the foundation of that maintenance.’ Pieper adds, referring to the OECD report published last year that concludes that Dutch water works are unparalleled by any other country, but that awareness remains at low levels.

Visit the Studio Roosegaarde website to view many more photos of Waterlicht.

[via designboom]

Txch This Week: Smarter Smartboards And Wireless Brain Sensors

by Jared Kershner

This week on Txchnologist, researchers looking to reveal the details of how dinosaurs move have created an advanced simulation using a chicken-like bird as their model. Moving virtual bones were then dropped in to recreate how the animal’s stride disturbs the surface it travels across. The work is providing new insights into dinosaur locomotion.

Researchers in South Korea and the U.S. may have built the smartest artificial skin yet – its texture is stretchy like human skin, and it also senses pressure, temperature and humidity. It even contains a built-in heater to mimic living tissue. The researchers have tested this new artificial skin on a prosthetic hand, and their next goal is to integrate the system with a patient’s nerves so amputees can sense what it feels.

NASA reports that its Curiosity rover has uncovered details of a large lake that existed on Mars more than 3 billion years ago. This body of water partially filled a crater called Gale near the planet’s equator, which was fed by melting snow that flowed in from its northern rim. Additionally the rover has found evidence of streams, river deltas and a history of filled and dried lakes around the crater, indicating that the area went through multiple hydrologic cycles over millions of years.

Now we’re bringing you the news and trends we’ve been following this week in the world of science, technology and innovation.

Keep reading

Why blue is the hardest colour

The now ubiquitous LED has been used in electrical components since 1962, and can be found everywhere from car headlights to barcode scanners. Blue LEDs are required to create white light, which makes LEDs suitable for smartphone and computer screens and bright, highly efficient, long-lasting light bulbs. But it wasn’t until 1994 that the first blue LEDs were made, earning the three inventors the 2014 Nobel Prize in Physics.

So what is it that makes blue LEDs so difficult to manufacture?

Using computer simulations, scientists at UCL, in collaboration with the University of Bath and Daresbury Laboratory, looked at the properties of the main component in blue LEDs, gallium nitride, to better understand just why blue LEDs are so hard to make.

LEDs are made of two layers of semiconducting materials – one with negative charges, or electrons, available for conduction, and the other positive charges, or holes. When a voltage is applied, an electron and a hole meet at the junction between the two and a particle of light (photon) is emitted.

‘While blue LEDs have now been manufactured for over a decade, there has always been a gap in our understanding of how they actually work, and this is where our study comes in. Naively, based on what is seen in other common semiconductors such as silicon, you would expect each magnesium atom added to the crystal to donate one hole. But in fact, to donate a single mobile hole in gallium nitride, at least a hundred atoms of magnesium have to be added. It’s technically extremely difficult to manufacture gallium nitride crystals with so much magnesium in them, not to mention that it’s been frustrating for scientists not to understand what the problem was.’ Said lead author John Buckeridge.

Co-author Richard Catlow, also of UCL, explains, ‘The simulation tells us that when you add a magnesium atom, it replaces a gallium atom but does not donate the positive charge to the material, instead keeping it to itself. In fact, to provide enough energy to release the charge will require heating the material beyond its melting point. Even if it were released, it would knock an atom of nitrogen out of the crystal, and get trapped anyway in the resulting vacancy. Our simulation shows that the behaviour of the semiconductor is much more complex than previously imagined, and finally explains why we need so much magnesium to make blue LEDs successfully’.

You can view the paper here.  

For all things blue, take a look at this blog on colour.  

By Simon Frost