Τετάρτη 30 Δεκεμβρίου 2015
Τετάρτη 23 Δεκεμβρίου 2015
Δευτέρα 7 Δεκεμβρίου 2015
Η ψηφιακή υπογραφή στην Ελλάδα, δια χειρός της Byte: Πώς λειτουργεί
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Παρασκευή 27 Νοεμβρίου 2015
Νέα Υπηρεσία e-Invoice από τη SingularLogic
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Τρίτη 24 Νοεμβρίου 2015
Νέα υπηρεσία e-Invoice από τη SingularLogic
via SingularLogicCo http://www.youtube.com/channel/UCj73SHAokiSmGdVbzREPuBw
Τετάρτη 11 Νοεμβρίου 2015
Πέμπτη 5 Νοεμβρίου 2015
Τετάρτη 4 Νοεμβρίου 2015
Τρίτη 3 Νοεμβρίου 2015
Στη μικρή οθόνη επιστρέφει το Star Trek
Το CBS ανακοίνωσε ότι θα φέρει ξανά στη μικρή οθόνη τη σειρά επιστημονικής φαντασίας που αγαπήθηκε από θεατές σε ολόκληρο τον κόσμο: το Star Trek. Παράλληλα, ετοιμάζεται και η νέα ταινία της σειράς ταινιών.
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Δευτέρα 2 Νοεμβρίου 2015
Ο Inmarsat επιλέγει τον ΟΤΕ για την παροχή internet σε πτήσεις πάνω από την Ευρώπη
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Πέμπτη 29 Οκτωβρίου 2015
Τέλος στις χρεώσεις περιαγωγής και ισότιμη πρόσβαση στο διαδίκτυο
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Πέμπτη 15 Οκτωβρίου 2015
Παρασκευή 2 Οκτωβρίου 2015
Τετάρτη 30 Σεπτεμβρίου 2015
Lenovo: Βασική εγγύηση 2 χρόνια Pickup & Return για όλη την Ελλάδα
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Δευτέρα 14 Σεπτεμβρίου 2015
Παρασκευή 11 Σεπτεμβρίου 2015
Παρασκευή 4 Σεπτεμβρίου 2015
WiFi App δείχνει το ιδανικό σημείο τοποθέτησης του WiFi Repeater
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Τετάρτη 2 Σεπτεμβρίου 2015
Δευτέρα 31 Αυγούστου 2015
Τετάρτη 26 Αυγούστου 2015
Ο Στίβεν Χόκινγκ προτείνει νέα λύση στο μυστήριο της μαύρης τρύπας
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Παρασκευή 14 Αυγούστου 2015
Επίσημο το Samsung Galaxy S6 edge+ με διπλή κυρτή οθόνη 5,7 ιντσών
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Τρίτη 11 Αυγούστου 2015
Δευτέρα 10 Αυγούστου 2015
Πέμπτη 6 Αυγούστου 2015
Δευτέρα 3 Αυγούστου 2015
Microsoft: 14 εκατομμύρια υπολογιστές τρέχουν ήδη Windows 10
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Παρασκευή 31 Ιουλίου 2015
Τετάρτη 29 Ιουλίου 2015
Χίλιες φορές πιο γρήγορη η μνήμη 3D Xpoint που παρουσίασε η Intel
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Τρίτη 28 Ιουλίου 2015
Τι θα φέρουν τα Windows 10 στο σπίτι στις 29 Ιουλίου
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Παρασκευή 24 Ιουλίου 2015
Η NASA ανακαλύπτει τον Kepler 452b με χαρακτηριστικά παρόμοια με της Γης
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Πέμπτη 23 Ιουλίου 2015
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Δευτέρα 20 Ιουλίου 2015
Κυριακή 19 Ιουλίου 2015
Πέμπτη 16 Ιουλίου 2015
Τετάρτη 15 Ιουλίου 2015
This is the first high-resolution image of Pluto's surface
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Αναβάλλεται ο γύρος του κόσμου με ηλιακό αεροπλάνο
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Τρίτη 14 Ιουλίου 2015
Plexit: Γιατί ο Πλούτωνας εκδιώχθηκε από το κλαμπ των πλανητών
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The Big Picture: NASA previews best Pluto images yet
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Σε εξέλιξη το πρώτο, ιστορικό πέρασμα από τον Πλούτωνα
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Apple Could Have Bailed Out Greece—Twice
How much cash does Apple have on hand? About as much as the value of Romania's GDP. And enough to bail Greece out---twice.
The post Apple Could Have Bailed Out Greece—Twice appeared first on WIRED.
via WIRED http://www.wired.com
Δευτέρα 13 Ιουλίου 2015
Στο επίσημο Top500 ο πρώτος ελληνικός υπερυπολογιστής
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Παρασκευή 10 Ιουλίου 2015
Πέμπτη 9 Ιουλίου 2015
Microsoft: Περικοπές 7.800 θέσεων εργασίας – Τι προβλέπεται για το μέλλον
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Τετάρτη 8 Ιουλίου 2015
Τρίτη 7 Ιουλίου 2015
Opportunity: Έντεκα χρόνια περιπέτειας στον Άρη σε οκτώ λεπτά
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Παρασκευή 3 Ιουλίου 2015
Οι λεπτομέρειες για το λανσάρισμα των Windows 10 – Ποιοι θα το πάρουν πρώτοι
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Τετάρτη 1 Ιουλίου 2015
Υπογράφηκε η σύμβαση με SingularLogic για το δημοψήφισμα
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Παρασκευή 26 Ιουνίου 2015
NASA is putting Microsoft's HoloLens to work in space
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Πέμπτη 25 Ιουνίου 2015
What Are All Those Weird Noises You Hear on an Airplane?
I used to work at Boeing and repaired the computerized part of the machines which put together 747’s. People not familiar with airplanes are scared because they are forced to be quiet and go along with acting normal while stuck in a tube hurtling through the air at 600 miles an hour, and 30,000 feet above the earth. What could go wrong?
Surprisingly, not much. These things are engineered and tested over and over to make sure they are safe. The number of deaths now—even from planes that crashed—is incredibly low. Most people now walk away from aircraft disasters unless the plane was blown up on purpose. That is hard to do now also. So let me show you a picture I’ve seen that many people never see. It is wings being bent in testing at a level they never would be in real life. They have to withstand every possible stress.
Image Credit: Boeing
Let’s get back to the noises and a checklist so you can know what is happening.
They have an APU at the back of the plane which is the auxiliary power unit. That baby hums along while you are boarding the plane to keep every thing up and running while the main engines are off. In addition, most airports hook the plane up to the ground units to pump air and electricity into the plane to save gas and money. When they close the door, you will hear a change and both the air and lights will flicker as they switch from the airport system to the aircraft system.
Then they will start each engine and you will hear the whine of the spin-up and then the ignition as it fires up, the roar. They usually have a tug (vehicle) push back the plane from the terminal though some planes actually can make the exhaust go in reverse to back the plane up.
The engines get louder to do this, then quiet down. Now it starts to taxi on the apron of the airport as the tower tells them where to get in line to use the assigned runway.
In mostly Airbus planes, they have a fuel saving device called the power transfer unit, or PTU. It is making sure the hydraulic pressure is balanced when they only use one engine during push-back and taxiing. Everyone wants to save fuel so this is their option. It’s noisy and a bit unnerving as it cycles on and off, on and off, on and off due to pressure fluctuations. It sounds like a dog in the hold with a high pitched bark to some—wooof-wooof-wooof wooof...
Airbus has another, higher pitched servo noise as prolonged whine which happens by the gate prior to departure and then after landing. It’s from an electric hydraulic pump used to open and close the cargo doors.
While they are taxiing, the wheels make a bump noise at each tar strip because there isn’t much of a shock absorber on airplanes. As they taxi, the pilot and copilot take the time to actually check all the systems on the plane making sure each one does what it is supposed to. There are lights which let them know every single function and if anything is even a little bit off.
It also might be interesting for you to know there are 4 separate systems built in every airliner so if one goes bad, there are three others to back it up. So you will hear the little servo electrical motors that move the control surfaces of the plane reassuring the pilots everything is working correctly.
It also might be reassuring for you to know, each of the pilots has an exact model of the airplane they are flying as a simulator they have to train on. While in that, the trainers turn off motors suddenly, have electrical systems fail, rudders not work—everything imaginable go wrong and the pilots have to land it safely or they fail. Your guys passed flight safety.
So back to the taxi. Now you are in line and next to go. The pilot moves out to the end of the runway where if you look out you can see a bunch of wide white stripes painted on the runway with a lot of black skid marks. That’s when they come in for a landing, the white tells the pilot where the end is. Your pilot wants the plane to get in the air easily so he flips a switch to make the wings almost twice as wide as they normally are. Those are flaps which make a whirring sound as the servos push them open. You can see them drop down if you’re sitting in back of the wing.
So now you hear the engines rev up and feel the push into your seat from moving forward. You’ll be able to tell if a wheel is a little out of round because the bump of the tar strips mingle with the speed of the spinning wheels as they speed up and go blump, blump, blump.
It always is a game I play to see how fast the aircraft needs to go before it can “plane” into the air. When it goes fast, the air gets thick and acts like water. Like sticking your hand out of the car window at 60 MPH. The airplane has to go at least a hundred miles an hour before it can bite into the air.
The pilot is watching a gauge which tells him exactly what it is. When it is just the right moment, he pulls back the control yoke and the nose wheel will spin like crazy. Then he pulls a little farther and you will hear both wing wheels come off the runway and spin like mad, but you won’t hear that slap any more.
Now you will hear some of those small electric motors as the wheels are pulled up into the plane and the snap of the doors closing, first one then the other. It will get noticeably quieter immediately. Now another whine as the pilot doesn’t need the big wing for takeoff any more, he will bring the flaps back into their normal place. All that is called cleaning up the plane so it is smooth and streamlined.
Now the engines are quieted down as they settle into gaining altitude while ground control tells them what direction to fly, making sure no one else is around your airplane. Next, the stewards get busy to make your flight pleasant as they can by serving you. Settle back and sleep or enjoy a view relatively few in the world ever get to experience.
When you land, you notice some of those noises again. First the engines will change tone and you feel a slight change as the plane slows down and starts to lower the nose. After a while, that may get even a little steeper while they are instructed where to get in line up in the air. Now the plane is going too fast so they slow it down by having some parts on top of the wing lift up a little which make a bunch of windy noise; you might hear some of those small electrical motors again. The pilots align the plane with the runway and start flying towards the end of the runway.
As they get close, they want that big wing again so they make those flaps come out from the back of the wing and sometimes they even make a little one open on the front of the wing to make it even larger. You can hear the wind like mad now and if you are by a window, sometimes see the air is being squished so much, it leaves little vapor trails which follow the airstream over the wing. There is a big noise as a bang and that is the landing gear doors being opened again, then bigger machine noises while the wheels are lowered into place until they lock with a click. Wind is really roaring.
The pilot has to see three green lights on his panel to know all the wheels are where they belong and it is safe. Next, he gets the plane at just the right speed over the end of the runway and slows the engines enough to let it touch the wheels. They bark like dogs as the tires go from a complete stop to spinning over a hundred miles an hour.
Then the pilots have to make sure the plane stays on the ground and stops so they flip a switch and a bunch of panels come out of the wings to force the plane to stay down and they have special shields on the engines which allow them to push air frontwards slowing the plane even more. They are loud roars.
You’ll notice a almost grinding noise as he steps on the brakes just like your car. He pushes down hard to slow the plane making that squally-grindy sound and you can feel the pressure of stopping. It usually pulses a little as he presses then lightens, then presses again. When it is slow enough, he pulls in all those parts of the wings needed to land safely with the whirring servo’s and then ground control tells him what taxiway he is to use to approach the terminal. He’s also told which gate he is assigned.
You will hear the dog in the hold on the airbus planes as the PTU balances out again. Once the pilot pulls up to a stop, he will shut off the engines and it will switch to the APU and then you’ll notice the flicker when the ground crew hooks up the service equipment to the plane. The bell boings and you get your luggage down. Breathe.
Now the only problem is dodging overhead luggage from people bringing everything they own to avoid baggage fees.
About the author: Mike Leary, Psychotherapist in private practice
This answer originally appeared on Quora.
You can follow Quora on Twitter, Facebook, and Google+.
via Gizmodo http://gizmodo.com
Τρίτη 23 Ιουνίου 2015
Πέμπτη 18 Ιουνίου 2015
Τρίτη 16 Ιουνίου 2015
Τρίτη 9 Ιουνίου 2015
Δευτέρα 8 Ιουνίου 2015
Διαστημικό ιστιοφόρο ξυπνά και ανοίγει πανιά
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Τετάρτη 3 Ιουνίου 2015
Τρίτη 2 Ιουνίου 2015
Τα Windows 10 έρχονται επίσημα στις 29 Ιουλίου – Απαιτήσεις και περιορισμοί
via pestaola http://www.pestaola.gr
Πέμπτη 28 Μαΐου 2015
Τετάρτη 27 Μαΐου 2015
ΗΠΑ: Άδεια στη SpaceX για εκτοξεύσεις στρατιωτικών φορτίων
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Παρασκευή 15 Μαΐου 2015
Τετάρτη 29 Απριλίου 2015
Δευτέρα 27 Απριλίου 2015
Πριβέ προβολή του Gravity για... τους αστροναύτες στο Διεθνή Διαστημικό Σταθμό
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Παρασκευή 24 Απριλίου 2015
To YouTube έγινε δέκα χρονών
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Τετάρτη 22 Απριλίου 2015
Τρίτη 21 Απριλίου 2015
Δευτέρα 20 Απριλίου 2015
In 2017, Norway will be first country to shut down FM radio
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Κυριακή 19 Απριλίου 2015
World's First Battery Powered Rocket Could Slash Launch Costs
The world’s first battery-powered rocket not only sounds like something straight out of science fiction, it could very well upend the space industry by ushering in a new wave of frequent and low-cost rocket launches.
The carbon composite “Electron,” unveiled last week by the Auckland-based company Rocket Lab, claims to be a radical departure from its modern-day competitors. Rather than using expensive and complex gas generators, it employs electric motors and lithium polymer batteries to drive its turbo pumps. It’s also the first hydrocarbon engine to use 3D printing for all of its critical components. And rather than focusing on big, infrequent payloads, Electron is aiming small.
That is, Electron is designed carry mini satellites—up to 100 kilograms—to a 500 km orbit above the Earth. While that may not sound super impressive, given that the average Earth-orbiting satellite today weighs upwards of 2,000 kg, there’s a kicker. As Rocket Lab’s chief executive Peter Beck told Quartz, Electron can shoot small payloads into orbit for less than $5 million dollars. That’s a fraction of what it costs to launch bigger and more powerful rockets today. (For comparison, the Space X Falcon 9, which launched 6 times last year, cost about $60 million per launch.) With 30 launch commitments already lined up, Rocket Lab is hoping to begin shooting its Electron skyward every month in 2016.
What this could potentially do is usher in a new wave of space traffic, with universities, private companies and other small enterprises using Electron to hitch a cheaper and faster ride into space to deliver a small payload. This means we might soon bear witness to a torrent of small, lightweight space satellites, which could be used for everything from climate monitoring to creating a global Internet. (Which sounds, uh, awesome. But also: Lots more space junk.)
Still, Electron’s first test launch is slated for the fall, so we’ve still got a bit of a wait before we know for sure whether this potentially game-changing rocket can deliver all that it promises.
Read more about the tech at the heart of the first battery powered rocket over at Quartz.
Top image: Rocket Lab’s Rutherford engine, via Rocket Lab
Follow Maddie on Twitter or contact her at maddie.stone@gizmodo.com
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Βίντεο: Εκτοξευτήρας απελευθερώνει σμήνος αυτόνομων drone
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Σάββατο 18 Απριλίου 2015
Ταξίδι στους αιθέρες με αεροσκάφος Star Wars
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Τετάρτη 15 Απριλίου 2015
Τρίτη 14 Απριλίου 2015
Σάββατο 11 Απριλίου 2015
Incredible GoPro footage shows what it's like to spacewalk
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Τετάρτη 8 Απριλίου 2015
Τρίτη 7 Απριλίου 2015
Δευτέρα 6 Απριλίου 2015
Κυριακή 5 Απριλίου 2015
10 αντικείμενα που κάποτε έμοιαζαν πολύ σημαντικά και τώρα δεν τα θυμόμαστε καν
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Παρασκευή 3 Απριλίου 2015
Πέμπτη 2 Απριλίου 2015
Τετάρτη 1 Απριλίου 2015
Η Dell παρουσίασε την ευρύτερη στρατηγική της για την Ελληνική αγορά
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Τρίτη 31 Μαρτίου 2015
Παρασκευή 27 Μαρτίου 2015
Πέμπτη 26 Μαρτίου 2015
Βίντεο: Δείτε τι παθαίνει ένα CD σε υψηλές στροφές
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Τετάρτη 25 Μαρτίου 2015
50 Years Ago, NASA Astronauts Smuggled a Corned Beef Sandwich Into Space
On March 23, 1965, astronaut John Young reached into his pocket and offered his crewmate Gus Grissom a corned beef sandwich. It was in the middle of the Gemini 3 mission, and let's be clear, they were in space. It was a silly little prank but one that, man, really pissed off Congress.
Gemini 3 was NASA's first two-man space mission, and among its many objectives was to test newly invented space food. For example, writes Robert Z. Pearlman in Space.com, the test foods were coated in gelatin to prevent crumbling.
The smuggled corned beef sandwich, of course, had no such special coating. Fellow astronaut Wally Schirra had bought the sandwich from Wolfie's Restaurant and Sandwich Shop two days ago and passed it off to Young before the launch. Food doesn't taste so good in space, and it's hard to believe a two-day old corned beef sandwich would be delicious. In any case, Grissom had to put it away after a bite, when crumbs started floating everywhere. Oops, microgravity.
Back on Earth, the House of Representatives' appropriations committee caught wind of the stunt. "A couple of congressmen became upset, thinking that, by smuggling in the sandwich and eating part of it, Gus and I had ignored the actual space food that we were up there to evaluate, costing the country millions of dollars," Young wrote in his memoir. NASA eventually had to assure Congress that no, it wasn't going to allow any more contraband corned beef sandwiches into space.
Young would make several more trips into space with Gemini 10, Apollo 10, Apollo 16, and the space shuttle. Corned beef made it back into space, too, on the first space shuttle flight in 1981 commanded by none other than Young himself.
Read more about the smuggled corned beef sandwich on Space.com.
Top image: John Young (left) and Gus Grissom (right). NASA
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Δευτέρα 23 Μαρτίου 2015
Τετάρτη 11 Μαρτίου 2015
Τρίτη 10 Μαρτίου 2015
Η CIA «προσπαθούσε να σπάσει το λογισμικό ασφαλείας» του iPhone
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Τέλη Απριλίου στην αγορά εννέα χωρών το Apple Watch
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Δευτέρα 9 Μαρτίου 2015
Κυριακή 8 Μαρτίου 2015
What it looks like in the Arctic Circle when the Sun never sets
This time lapse shows what 24 hours of a summer day (and I guess, a summer night) looks like in the Arctic Circle. You can see the Sun rising and setting like it normally does anywhere else but instead of disappearing beyond the horizon as the Earth turns, it pops right back up and the world never turns dark.
It's like living inside a 2D side scrolling video game. The time lapse was filmed by Maxie Max.
SPLOID is delicious brain candy. Follow us on Facebook or Twitter.
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Πέμπτη 5 Μαρτίου 2015
Imaging a supernova with neutrinos
via Ars Technica http://arstechnica.com/
Τετάρτη 4 Μαρτίου 2015
Τρίτη 3 Μαρτίου 2015
The First Detailed Image of the World's Smallest Known Life-form
This picture might look a little grainy, but you're actually looking at the first detailed image of the ultra-small bacteria that are believed to be "about as small as life can get."
The image was acquired by scientists from the U.S. Department of Energy's Lawrence Berkeley National Laboratory and the University of California, Berkeley. The ultra-small bacteria, thought to be fairly common, are difficult to image—not just because they're small, but also because they're quite delicate and can easily die. These samples were captured by being flash frozen to -272 degrees C before being transported to the lab.
While they're common, their role in the natural world is poorly understood. "They're enigmatic. These bacteria are detected in many environments and they probably play important roles in microbial communities and ecosystems. But we don't yet fully understand what these ultra-small bacteria do," explains Jill Banfield, one of the researchers who acquired the images using cryogenic transmission electron microscopy.
It is thought, however, that this is as small as a cell can be while still accommodating enough material to sustain life. With an average volume of just 0.009 cubic microns, they're certainly pretty small; in fact, you could fit more than 150,000 of them into the same volume as a single E-coli cell. And now, you known what they look like. [Nature, Berkeley Lab via Engadget]
Image by Berkeley Lab
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Δευτέρα 2 Μαρτίου 2015
Σάββατο 28 Φεβρουαρίου 2015
Πέθανε ο Λέοναρντ Νιμόι, ο αγαπημένος Σποκ του Star Trek
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Πέμπτη 26 Φεβρουαρίου 2015
Δευτέρα 16 Φεβρουαρίου 2015
Κινεζικό ενδιαφέρον για την ελληνική βιομηχανία υψηλής τεχνολογίας
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Κυριακή 15 Φεβρουαρίου 2015
Και η Apple στην κούρσα των ηλεκτρικών αυτοκινήτων
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Σάββατο 14 Φεβρουαρίου 2015
Report: Apple has “several hundred” staffers building an electric car
via Ars Technica http://arstechnica.com
Πέμπτη 12 Φεβρουαρίου 2015
Το επόμενο όραμα του Elon Musk είναι μπαταρίες που θα τροφοδοτούν… σπίτια!
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Παρασκευή 6 Φεβρουαρίου 2015
Πέμπτη 5 Φεβρουαρίου 2015
Τετάρτη 4 Φεβρουαρίου 2015
Πτήση με drone πάνω από τα φουτουριστικά νέα γραφεία της Apple
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Δευτέρα 2 Φεβρουαρίου 2015
Σάββατο 31 Ιανουαρίου 2015
This is what's happening inside your camera at 10,000 frames per second
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Πέμπτη 29 Ιανουαρίου 2015
The Nobel prize-winning inventor of the laser dies at 99
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Τρίτη 27 Ιανουαρίου 2015
Παρασκευή 23 Ιανουαρίου 2015
Πέμπτη 22 Ιανουαρίου 2015
Βίντεο: «Ο Αλαν Τούρινγκ και η μίμηση του νου»
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Τετάρτη 21 Ιανουαρίου 2015
Δευτέρα 19 Ιανουαρίου 2015
Ο Έλον Μασκ βάζει μπρος το υπερηχητικό τρένο του
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Σάββατο 17 Ιανουαρίου 2015
Lost Beagle 2 Mars lander found 11 years after launch
via Ars Technica http://arstechnica.com
Παρασκευή 16 Ιανουαρίου 2015
Τρίτη 13 Ιανουαρίου 2015
Τετάρτη 7 Ιανουαρίου 2015
Η διασημότερη εικόνα του Hubble σε νέα λήψη
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