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geek tech

What is data compression?


As Linus explains it: is cramming a ton of info into a tiny file. The more homogeneous the data in a file is the more can it be compressed.

Let’s take the example of an image. If it is only white, then the compressed file will say something like this: put a white pixel in these positions [then the range]. The same happens with a jpeg image: you simply tell the computer to build the image pixel by pixel like this: on pixel (x,y) insert a color (rgb color). Neat, huh?

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geek learn tech

How to Make a Matchbox Microphone


Have you ever thought of creating a microphone? For this you need a matchbox and pencil leads. Also need a battery, some wires and clips, and a pair of headphones or a speaker.

This is a simple experiment that you can do at home and prove the concept of sending sounds through electrical wires to a speaker. I never thought it would be that easy to create a microphone. Have fun!

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tech

The super science music video of the day: Science STYLE – Taylor Swift Acapella Parody


The guys at ASAP Science have created an awesome Taylor Swift Acapella Parody called Science STYLE. In the hands of great communicators science does blossom in ways you would never think of. Science is great and truly amazing, but many regards it as a fringe domain, something on the far side of the World.

Science, on the other side, was created to reveal the inner workings on the Universe and create a system of laws, principles and theories to allow us to make sense of everything.

Truth is, science saves lives, makes us feel better, give us better lives. Science rules.

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geek tech

Drones and music: awesome art

Ever wanted to see drones sing? Now you can! KMel Robotics has programmed a group of hexrotors and those tiny robotic critters are making a cute music show.

Drones are good for a ton of uses, but mostly people are using them for fun. And fun it is! Such ahex rotor can cost even $1100 like DJI Naza one
Via Interesting Engineering.

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science tech

Heart Sun’s neutrino heartbeat


The researchers based in Gran Sasso National Laboratory near L’Aquila, Italy, about 1 kilometer into the ground, were able, even in 2007 to detect some of the neutrinos from the Sun, essentially confirming that the theorized fusion reactions, which include the presence of berilium, are correct.

Science20 reported at that time about Sun’s neutrino heart beat. The researchers were able to detect low level neutrinos in the range of 0.862 MeV. They used the Borexino detector to get a glimpse into the universe of these tiny neutrinos.

Sun’s neutrino heartbeats are about 2-3 pe hour. Watch the timer in the video from above.

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geek learn tech

How Digital Light Processing (DLP) works


Ben Krasnow, from Applied Science, explains how a projector works. He is one of the most skilled guys I’ve seen on Youtube. If he does not have a tool or device, he builds it and then moves on.

Digital Light Processing (DLP) works by using a ton of microlenses that reflects the light corresponding to one pixel to a screen. As opposed to LCD projectors, Digital Light Processing has smaller energy consumption and a better image quality.

The fact that you can use microlenses, lenses that are only 10 micrometers in length, and that you can move them is an incredible feat. In the video from above you will see how such microlenses are looking when using a scanning electron microscope. Awesome!

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learn tech

A short history of robots


Hank Green, from SciShow, presents a short history of robots, from the industrial robots to the humanoid robots we have today. DARPA is hosting a robot contest in this summer and humanoid robots will fight each other to win the trophy the best human robots ever.

Also, see some humanoid robots running:

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learn science tech

Science and technology helping medicine


Medicine has come a long way since the ages of homeopathy, guesses and whatnot. Right now we have a ton of science behind medicine and technology is creating a better world for us and for the doctors.

In the future the doctors will be able to see the heart in 3D right there, in the op room. Such technology will allow them to check for any issues in real time, in 3D.

Thanks for sharing Nikki, via thenorthpoleshoppe.com.au.

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tech

Der Ziesel – offroad wheelchair


Well, you can say that it is in no way a wheelchair. It is a personal offroad tank or the sorts. Der Ziesel can go on snow or on dirt with no issues and it can reach 35 kmh on straight road.

The prices range from 21 000 euros for Ziesel 63 and 24 500 euros for Ziesel Pro. You can buy accessories for it too

Via Interesting Engineering.

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geek tech

How do we store digital images and how do image sensors work?


We store digital images as a series of 0s and 1s, but how we manage that info is another story altogether. Am image is a long string of pixels which starts with the header (we insert there the EXIF data), then a number of pixels, then a padding data and then the next number of pixels. Each pixel can be represented by 1 byte or 8 bits of data which is called a bit depth of 8.

Grayscale are usually 8 bit depths, but rgb are 32 bit depth images (3x 8 for rgb, and another 8 bits for alpha, for example).

Now, how do we capture those images and then convert them to digital information? See below:

Linus explains what image sensors are and how they work. In order for us to capture the images in digital format the light is first passing through a series of red, green and blue filters and then it hits the sensor.

The sensor then converts the light it gets into electric current which is later converted into digital code. There are two types of sensors: CCD and CMOS.

CCD is short for Charged Coupled Device and CMOS is short for Complementary Metal-Oxyde Semiconductor. CCD processes charges individually from bottom to top, it then converts them into current and then into digital information. Consumes more power, but offer less noise. More expensive.

CMOS, on the other hand, handles each pixel, not like CCD which takes in charges row by row. It has less power usage than CCD. Less expensive.