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The dream of soaring in the sky like a bird has captivated the human mind for ages. Although many failed, some eventually succeeded in achieving that goal. These days we take air transportation for granted, but the physics of flight can still be puzzling. In this article we’ll investigate what makes airplanes fly by looking at the forces generated by the flow of air around the aircraft’s wings. Mo
There is something delightful about riding a bicycle. Once mastered, the simple action of pedaling to move forward and turning the handlebars to steer makes bike riding an effortless activity. In the demonstration below, you can guide the rider with the slider, and you can also drag the view around to change the camera angle: Compared to internal combustion engines or mechanical watches, bicycles
Invisible and relentless, sound is seemingly just there, traveling through our surroundings to carry beautiful music or annoying noises. In this article I’ll explain what sound is, how it’s created and propagated. Throughout this presentation you will be hearing different sounds, which you will often play yourself on little keyboards like the one below. You can either click its keys with your mous
In the world of modern portable devices, it may be hard to believe that merely a few decades ago the most convenient way to keep track of time was a mechanical watch. Unlike their quartz and smart siblings, mechanical watches can run without using any batteries or other electronic components. Over the course of this article I’ll explain the workings of the mechanism seen in the demonstration below
GPSGlobal Positioning System is, without a doubt, one of the most useful inventions of the late 20th century. It made it significantly easier for ships, airplanes, cars, and hikers to figure out where they are with high degree of accuracy. One of the most exciting aspects of this system are the satellites surrounding Earth. Here’s a current constellation of active satellites, you can drag the view
Naval ArchitectureWhen I first heard the term naval architecture I thought it was the artistic practice of designing beautiful boats. It turns out it’s a proper scientific discipline dedicated to the engineering of ships. Over the course of this article we’ll go over different aspects of naval architecture. I’ll explain how ships are propelled, what makes them stay afloat, and how they’re carefull
Cameras and LensesPictures have always been a meaningful part of the human experience. From the first cave drawings, to sketches and paintings, to modern photography, we’ve mastered the art of recording what we see. Cameras and the lenses inside them may seem a little mystifying. In this blog post I’d like to explain not only how they work, but also how adjusting a few tunable parameters can produ
Lights and ShadowsIt’s hard to describe how paramount light is. Ultimately, it is the only thing we see. But just as important the presence of light is, so is its absence. To talk about light we have to start in darkness so let’s jump straight into it. Light is a visible portion of electromagnetic radiation, but in this article I’m not going to discuss any of the underlying details like wave-parti
I’ve always been fascinated by mechanical gears. There is something captivating about the way their teeth come together to create a fluid, unified motion: In this blog post I’d like to look at these simple machines up close. I’ll explain how gears affect the properties of rotational motion and how the shape of their teeth is way more sophisticated than it may initially seem. Movement is important
For the longest time we didn’t have to pay a lot of attention to the way we talk about color. The modern display technologies capable of showing more vivid shades have, for better or for worse, changed the rules of the game. Once esoteric ideas like a gamut or a color space are becoming increasingly important. A color can be described in many different ways. We could use words, list amounts of CMY
I’m a huge fan of the transform property. Combining rotations, translations, and scalings is one of the easiest way to modify a shape of a UIView or a CALayer. While easy to use, regular transforms are quite limited in what they can achieve – a rectangular shape of a layer can be transformed into an arbitrary quadrilateral. It’s nothing to sneeze at, but there are much more powerful toys out there
Hash tables are just awesome. To this day I find it fascinating that one can fetch an object corresponding to an arbitrary key in constant time. Although iOS 6.0 introduced an explicit hash table, it is NSDictionary that’s almost exclusively used for associative storage. NSDictionary doesn’t make any promise of its internal implementation. It would make little sense for a dictionary to store its d
I’ve always wondered how NSMutableArray works internally. Don’t get me wrong, immutable arrays certainly provide enormous benefits: not only are they thread safe but also copying them is essentially free. It doesn’t change the fact that they’re quite dull – their contents can’t be modified. I find the actual memory manipulation details fascinating and this is why this article focuses on mutable ar
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