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geek learn science

Aloha: black holes also create stars. Bet you didn’t knew that


It seems that the very same process that leads to matter being eaten up and destroyed by a black hole can lead to the formation of new stars far away. As the black holes gobble up matter that matter will first rotate in a vortex like path around the black hole while it is falling inside it.

Before the matter is able to be eaten up by the black hole it is heating up like crazy due to friction with the rest of the matter that is falling into the back hole. This interesting process leads to a situation in which the black hole while it is eating up some of the matter it will also shoot out a part of it in a form of highly energized (heated up and accelerated to relativistic speeds) beam of matter/gas.

That beam of matter will then reach a nearby cloud or galaxy and it will help the gas clouds form blobs of gas that are heated up and are cramming more and more gas from its surroundings. In this way, while the black hole eats up matter in one place, it may also help to the formation of stars in another place. Incredible.

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geek learn science

Venus, not the best place for your holydays


Hank Green, from SciShow, explains why Venus is NOT Earth’s twin and why is it dangerous to live in there. In any case, you won’t be able to live in there not for even one second. The probes that landed there in the 70s and 80s coudl not even last for more than 50 minutes due to the temperatures above 480 degrees Celsius.

Also, the atmospheric pressure is 90 times than that of Earths. We would be crushed in an instant. More than 95% of the air from there is CO2 and it rains sulfuric acid. Just great for a trip to Hell. Not recommended.

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entertainment geek tech

Graphics cards comparison: Radeon R9 285 vs R9 290 vs GTX 760


Only recently I found out that the R9 graphics line from ATI was build upon the HD7000 series and so on. In any case, the guys were going up with the numbers like crazy. Setting on R9 as name is a good choice.

While R9 280 is build upon an older HD7000 graphics card, the R9 285 is a totally new thing. From that point on we’re talking new type of graphics cards and the 285 crushes the 280 and the GTX 760.

You can rest assured that if you buy a R9 295 you’ll all set for at least two years, until the game developers find out how to use more of your computer’s resources. For now, if you wanna buy a graphics card choose one starting with R9 285 and above. Great and quite cheap.

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geek learn

Vsauce about coincidences: we see them because we want to see them


It is as simple as that: coincidences pop up all the time here and there. It is our brains that make connections and want to see patterns and personifications where it should not. We should be very thankful that our brain is able to see patterns. Patterns discerning is what makes us special on this planet. Detecting patterns allowed us to write down the laws of physics and to find cures for many illnesses, but the same process of detecting patterns can hurt us.

Not everywhere we see a face or a patterns of some sorts was meant to be what we saw it to be. Coincidences are just that: coincidences.

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geek learn tech

The history of submarines: those things are quite old


The first submarine was a home made wooden craft built in the 1770s by David Bushnell. His first design was a simple wooden barrel with some levers that would make the vessel move around and dive. It wasn’t very robust, but it sparked a new era in navy combat. David bushnell’s “turtle” could not be used to defend New York in the upcoming war of 1771, but after more than 100 years the US Navy had it’s own submarines. And these worked!

Turtle_submarine_1776
(image source Wikipedia )

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geek learn science

Use science to keep your drinks cool


If you have a can of Coca-Cola or any other refreshment, it is hard to keep it cool when left outside the fridge. The guys at Inside Science explain why the can looses its cool: it is due to the condensation of water vapors outside the surface of the can. Water in the form of vapors comes in contact with the walls of the can, they become liquid and then they increase the flow of heat from the surroundings to the can by more than 2 times.

That means that if the air is humid, then the can will lose its cool way faster. Via Inside Science:

The solution? Beer koozies not only insulate a can, but also keep condensation from forming on the outside, which is important for keeping the beverage cool.

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entertainment geek

What’s the fastest animal in this world? Pilobolus, the fungus cannon

Pilobolus can eject the spores with a speed of up to 25 meters/second and it accelerates to the top speed in a millionth of a second. That means 20 000 G in that short period of time. That is simply insane.

No other animal of living being for that matter is that fast.

Now, let’s see something that is fast as hell: explosions. See the shockwave in front of the explosion? That is the shockwave that can rupture your organs if the blast is strong enough.

What you need to know is that explosives don’t need to lift you in the air and then throw you a mile away to kill you. They only have to send a shockwave through your body strong enough that your internal organs will rupture to pieces and you die. Check that first water baloon: it stoo in place, but it was blown to pieces.

When you see a grenade simply run:

Categories
geek tech

How was the first telephone built and how did it work?


The telephone was patented by Alexander Graham Bell in 1876 and its setup is way more complicated that I’ve previously thought. It isn’t just a simple rope/wire with some cups at the ends. It involves a battery, water, wires and a drum too.

How did the first telephone work? You needed a battery from which current would flow into a liquid. From that liquid the current would flow through a rod wire that was attached to a drum and then trough a wire attached to that rod. From there on the current would flow to a receiver, an electromagnet, where the sound was replicated.

Basically, when Bell spoke into the mouthpiece the air vibrated and then made the drum vibrate too. The rod attached to the drum would enter in the liquid thus affecting the flow of current through it. Since there was a difference in the current flowing in the wire the electromagnet at the receiving end would generate different types of vibrations in the drum that was used in that receiving end. Thus sound was created.

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geek learn science

The twin paradox


Nick from Science Asylum explains why the twin paradox is not a paradox. the paradoxes show up in our models and in our math, but they do not exist in the nature and the Universe is functioning perfectly even if we do not understand these physics paradoxes.

The twin paradox says that if one of the twins travels with the speed of light for a number of years and then returns home, the other twin will be much older. This is due to the fact that, when you travel close to the speed of light, the time slows down for you.

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geek opinion tech

Jeff Jarvis: Technoeuropanic, or how Germany leads the technosceptic movement in Europe

If I want to read a good piece of journalistic endeavour, then I read BuzzMachine.com. Jeff Jarvis, the writer of What Would Google Do?, an awesome book I have read in 2013 about the corporate policy and changes inside Google, explains why Germany is leading a technosceptic or, dare i say, a technophobic movement in Europe by targeting Google and Uber.

In this article Jeff reminds us that Germany blocked Uber from functioning in that country, before that it forced Google to not photograph its streets for the Street View project, then played into the “Right to be forgotten” craziness and now spearheads the attack on Google via publishers who ask it money to show their pages in the search results.

Well, here comes the fun: Google may very well stop showing all those sites in the SERP, search result pages. What will happen? Well, they will cry that Google only shows its own news services and theirs not. Now, if Google gives in and then shows their pages in the SERP they will ask for money.

That pretty much sounds like racketeering, my dear German neighbours. Really, Germans are targeting US services like crazy. Google has done a lot of good things for customers, even if it wronged many a webmaster, of AdWords partners and so on.

Germany seems to not like the internet as it is now: Google is showing your results in the pages and then Google is giving you some traffic. You don’t like that, then ask Google to not index your site. Is that simple.

Also, as Jeff points out, I find it amusing that the Germans ask Google to favor in some way third party services when it is showing the results page. Guys, Google is a private company and anyone is free to not use its search capabilities. Being a private company, even if a monopoly, you need to play by their rules because you’re in its house. Don’t like what Google has done, then do something better yourself instead of acting like crazy technosceptics or technophobics.