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A global cyber attack has been underway since Friday, affecting more than 200,000 organisations in 150 countries.  Already it has proved itself to be one of the most virulent and potentially destructive cyber attacks ever observed.  The " WannaCry " ransomware appears to have used a flaw in Microsoft's software, discovered by the National Security Agency and leaked by hackers, to spread rapidly across networks locking away files.  A security expert managed to stop the attack by triggering a "kill switch" on Saturday but it has continued to wreak havoc. Ransomware, which demands payment after launching a cyber attack, has become a rising trend among hackers looking for a quick payout.  WHAT IS A RANSOMWARE? Ransomware is a kind of software which helps in a cyber attack that involves hackers taking control of a computer system and blocking access to it until a ransom is paid. For cyber criminals to gain access to the system they ...

       reCAPTCHA is a Google Product and was designed to establish whether a computer user is human or not. Q. Isn’t reCAPTCHA just some random numbers or letters ? No . They are in-fact part of a larger Google project to digitise printed books. Books and even newspapers are scanned and are run through computer programs to identify individual words in the text. But now and then it happens that some part of the printed text is poorly scanned or is stained that it becomes difficult for  Google  systems to be  100% certain  as to what the word really is. In such cases these words are flagged as  suspicious  and are sent into the reCAPTCHA system. Over a period of time a lot of different users see the same letters and enter them into the reCAPTCHA boxes and after a while Google systems are able to deduce the correct spelling of the word using rather simple algorithms. This program later was further extended to include the ...

The Earth would be flung out of the Solar System, as we suddenly exceed the Solar Escape velocity ( 42 k m / s ) by several orders of magnitude. Within 3 minutes we will be outside the orbit of Mars. Within an hour we will have passed Jupiter. Within 5 hours, the Earth will be outside the orbit of Pluto. Within 16 hours, we will have overtaken Voyager 2. Within 19 hours we will have overtaken Voyager 1. Depending on the above given definition, we will leave the solar system some time between 17 hours and two days. At this point there’s a  whopping  great gap, as the planet cruises through interstellar space. Depending on what direction you head in, you may reach the following milestones (you won’t reach all of them, because they’re in opposite directions!) By the time Donald Trump’s first (only?) term ends (2021), we will have reached our nearest neighbour,  Proxima Centauri in the  α α -Centauri system By the time that the  first Mickey ...

1)The last picture of Adolf Hitler, 1945 Allegedly the last picture of Adolf Hitler before he committed suicide on . Hitler (right) and his adjutant Julius Schaub looking at the ruins of the Reich chancellery, April 28, 1945. This last known picture of Hitler was taken approximately two days prior to his death as he stands outside his Berlin bunker entrance surveying the devastating bomb damage. With Germany lying in ruins after six years of war, and with defeat imminent, Hitler decided to take his own life. But before doing so, he married Eva Braun and then penned his last will and testament. The next day in the afternoon on April 30, 1945 Braun and Hitler entered his living room to end their lives. Later that afternoon the remaining members of the bunker community found Hitler slumped over, and blood spilled over the arm of the couch. Eva was sitting at the other end. Hitler had killed himself by biting down on a cyanide capsule while shooting him self in the head. Eva ...

At the start of the scenario, the entire Earth’s population has been magically transported together into one place. This crowd takes up an area the size of Rhode Island. But there’s no reason to use the vague phrase “an area the size of Rhode Island.” This is our scenario; we can be specific. They’re actually in Rhode Island. At the stroke of noon, everyone jumps. As discussed elsewhere, it doesn’t really affect the planet. Earth outweighs us by a factor of over ten trillion. On average, we humans can vertically jump maybe half a meter on a good day. Even if the Earth were rigid and responded instantly, it would be pushed down by less than an atom’s width. Next, everyone falls back to the ground. Technically, this delivers a lot of energy into the Earth, but it’s spread out over a large enough area that it doesn’t do much more than leave footprints in a lot of gardens. A slight pulse of pressure spreads through the North American continental crust and diss...

The first thing to consider is that not everyone can see the Moon at once. We could gather everyone in one spot, but let’s just pick a time when the Moon is visible to as many people as possible. Since about 75 percent of the world’s population lives between 0°E and 120°E, we should try this while the Moon is somewhere over the Arabian Sea. We could try to illuminate either a new moon or a full moon. The new moon is darker, making it easier to see our lasers. But the new moon is a trickier target, because it’s mostly visible during the day—washing out the effect. Let’s pick a quarter moon, so we can compare the effect of our lasers on the dark and light sides. The typical red laser pointer is about 5 milliwatts, and a good one would have a tight enough beam to hit the Moon—though it’d be spread out over a large fraction of the surface when it got there. The atmosphere would distort the beam a bit, and absorb some of it, but most of the light would make it. Let’s assume ...