Geek magazine hacker daily blog

70 years ago on Earth for the first time accepted the radio signal reflected from the Moon

1 year, 3 months ago


Modern technologies exceed dreams and ideas of the present day of our ancestors. People without problems communicate with each other even if they live on different sides of the globe. NASA plans the piloted expedition for Mars, ESA — on the Moon. In space and very many different devices work at other planets.

With these devices the stable relation is kept, even New Horizons transfers a large number of information, being from Earth in billions of kilometers. In the forties the last century all this still was impossible, but scientists already took the first steps. So, on January 10, 1946 specialists from the USA recorded the first terrestrial radio signal reflected from the Moon surface. At 11:58 local time (New Jersey) was sent such signal, and in 2,5 seconds its reflection was registered on Earth.

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To mantises put on 3D glasses for the proof of existence at insects of stereoscopic sight

1 year, 3 months ago

And where my popcorn? (photo: Newcastle University)

The mantis in the announce photo received 3D points, and is absolutely free. At the same time also showed to an insect the 3D movie (the truth, not "Avatar"). It is made to prove existence of stereoscopic sight at insects which developed irrespective of vertebrata. Yes, monkeys, cats, mice and even toads have a stereoscopic sight — it is proved for a long time. At the majority of vertebrates such type of sight. But insects? How it is possible to define sight type at them?

To obtain the reliable evidence, scientists from university of Newcastle decided to take a species of insects with the most developed visual device and excellent reaction. It is about mantises (by the way, they also only among insects who can turn the head in the different directions voluntarily). For work with mantises the interesting technique which basic element — 3D points was created.

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SpaceX is going to put Falcon 9 on a sea platform again

1 year, 3 months ago


At the end of last year there was what many waited for — the SpaceX company managed to return the first step of the carrier rocket Falcon 9 to Earth. The step managed to be put, and its status allows to use Falcon 9 for the second time. In any case, Ilon Mask reported about it. Now the company is going again to try to put the rocket on a sea platform. Up to this point SpaceX two times tried to make it, and both times — are unsuccessful.

For this start it is going to use Falcon 9 v 1.1, it is the last copy of this version from being available. It was succeeded to put upgraded version of the rocket, with the increased draft. According to representatives of the company, landing to the sea will allow to use less fuel.

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Scientific myths which cannot be discredited

1 year, 3 months ago
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We constantly face substitution of reality false beliefs which not only bring the mass of inconveniences to ordinary people, but also interfere with development of science.

In 1997 doctors from southwest Korea adjusted practice of ultrasonic inspection for detection of cancer of thyroid gland at early stages. News of a new technique quickly extended, and soon all doctors in the region began to offer similar services. As a result, campaign purchased national character, and the government initiated the program of ultrasonic diagnostics of different types of cancer. Hundreds of thousands of volunteers agreed to pass tests of everything for $30-50.

The number of patients with the diagnosed cancer of a thyroid gland considerably increased in the country: from 5 cases on 100000 people in 1999 to 70 on 100000 in 2011. At two thirds of patients the thyroid gland was deleted that resulted in need of use of lifelong drug treatment. And both options of succession of events assumed serious risks.

It would seem, so large-scale and expensive program in the field of public health care had to save a set of lives. But, alas. Now a cancer of a thyroid gland – the most common form of this disease diagnosed in South Korea, and the number of the people dying of it did not change at all — about 1 100 000. But even when some local doctors noticed it and in 2014 the Korean association of a thyroid gland, the professional organization of endocrinologists and surgeons voiced opinion that it would be worth stopping inspections, objected, having declared that availability of specialized ultrasonography and treatment – inalienable rights of the person.

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Ask Ethan No. 42: Whether shines in the summer the Sun brighter?

1 year, 3 months ago
At the hottest moments of seasons, – in the summer in the northern hemisphere, and in the winter in southern, - you for certain wait for one of the listed phenomena:

— warm, bright, long sunny days
— cold, short, cloudy days which are the best of all for spending at home

But why these days become such? The reader asks:

It seems to me that in the summer the sun shines brighter. But if to consider change of distance from Earth to the Sun within a year whether such difference in brightness can be real?


Without doubts, the difference in the visible brightness of the sun in days of summer and winter solstices is rather noticeable.

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For the readers living out of tropics (at the latitudes more than 23,4 °), the summer solstice when the sun approaches a zenith most strongly is usual. During a winter solstice the maximum raising of the sun over the horizon on 46,8 ° is less, than during summer.

And it is possible not only to see this difference, but also to feel – on temperature!

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The Vietnamese military study the mysterious space spheres which came on a silver platter

1 year, 3 months ago
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Frame from the movie of "Spaceballs"

On January 2 three metal spheres fell to the maisovy field which is in the territory of the Vietnamese province Yenbay. Military suggested that 45-kilogram spheres can be the space debris which endured falling from an orbit. Incident investigation is conducted.

It is already known that spheres do not contain either explosives, or materials hazardous to health. Military claim that they did not stage any drills or tests in this region of the country. Eyewitnesses tell that they heard a sound like a thunder then spheres came on a silver platter.

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The German invented and tested an implant with the switch for sperm

1 year, 3 months ago
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The carpenter from Germany declared revolution in contraception. Clemens Bimek [Clemens Bimek] considers that its invention will be demanded and is popular: he patented and developed the valves with switches which are surgically implanted into semyavynosyashchy canals of men. Closing of the valve leads to the termination of an output outside of sperm.

Vazektomiya, bandaging or removal of a fragment of semyavynosyashchy channels for the purpose of achievement of sterility, is carried out already long ago. The first experiments are known since the 18th century, and in the regular mode this operation was for the first time performed in 1899. After operation at full save of sexual functions because of blocking of an output of sperm at men capability to conception vanishes.

In principle this operation is not considered for 100% reversible in this connection it is recommended to people of rather big age, or already having children. The legislation of some countries officially limits possibilities of carrying out this operation. For example, in Russia in connection with campaign for the termination of demographic crisis and for increase in the draft plan in Russian Armed Forces to citizens of Russia the vazektomiya (but also, and sterilization of women) is allowed only at the age of more than 35 years or in the presence of 2 and more children, or on medical indications.

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On the 3D printer printed the first-ever object from metal of an extraterrestrial origin

1 year, 3 months ago


The Planetary Resources company one of the first who began to consider seriously a question of mining out of Earth. It is about asteroids and other objects in space where it is possible to find resources, useful to people of Earth. Not just there is a lot of asteroids, and it is a lot of and if to learn to extract minerals from such objects at the responsible price, then the question of providing Earth could be considered as the components, necessary for our civilization, closed.

To attract attention, the company goes on different steps. This time Planetary Resources acted on CES, having provided the metal object printed on the 3D printer. Metal at the same time has an extraterrestrial origin — it was taken from the meteorite which fell in Argentina in prehistoric times. Printed a part of the Arkyd spacecraft developed now on new 3D Systems ProX DMP the 320th printer of direct printing with metal.

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Green power and nuclear silicon

1 year, 3 months ago
I think very few people are aware that all renewable power depends on work of research nuclear reactors today. It is about the nuclear alloyed silicon (NAS) received in it which is used for production of high-voltage power semiconductors without which RES are impossible. And now is more detailed.

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12-pulsny rectifiers (hang at the left) ultrahigh-voltage transmission lines are important consumers nuclear too - the alloyed silicon.

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Activity of a black hole can be observed also in the visible range

1 year, 3 months ago


Astronomers from the Kyoto university encouraged fans of astronomy worldwide. In the work published in the Nature log they showed how it is possible to observe activity of some types of black holes in the visible range by means of the normal telescope.

As the gravitational attraction of a black hole does not allow any radiation to leave limits of the area limited to the horizon of events directly it is physically impossible to observe them. Usually their detection happens thanks to existence around black holes of accretion disks.

In the course of falling of substance in a black hole because of rotation of gases around holes the disk is formed of interstellar gas and dust. Substance of a disk disperses to relativistic velocities and is warmed to millions of degrees because of what radiates in the different ranges. Up to this point scientists looked for radiation from accretion in x-ray and gamma ranges, and also with the infrared range – what normal amateur astronomers were not able to afford.

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