How Nuclear Bombs work ?

We have seen that these devices have incredible destructive power, but how do they work? In this article, you will learn about the physics that makes a nuclear bomb so powerful, how nuclear bombs are designed and what happens after a nuclear explosion.

Nuclear bombs involve the forces, strong and weak, that hold the nucleus of an atom together, especially atoms with unstable nuclei. There are two basic ways that nuclear energy can be released from an atom:

• Nuclear fission - You can split the nucleus of an atom into two smaller fragments with a neutron. This method usually involves isotopes of uranium (uranium-235, uranium-233) or plutonium-239.
• Nuclear fusion -You can bring two smaller atoms, usually hydrogen or hydrogen isotopes (deuterium, tritium), together to form a larger one (helium or helium isotopes); this is how the sun produces energy

In either process, fission or fusion, large amounts of heat energy and radiation are given off.

To build an atomic bomb, you need:

• A source of fissionable or fusionable fuel
• A triggering device
• A way to allow the majority of fuel to fission or fuse before the explosion occurs (otherwise the bomb will fizzle out)

Atomic Structure
Before we talk about the physics of atomic bombs, it's a good idea to go over the basic properties of atoms.

Atoms are incredibly small -- the smallest is about 10^-8 cm in diameter. For an idea of how small this really is, think of a baseball. The diameter of a baseball is about 7 cm. If an atom were the size of a baseball, an actual baseball would be about 3044 miles high.

An atom is made up of three subatomic particles -- protons, neutrons and electrons. The center of an atom, called the nucleus, is composed of protons and neutrons. Protons are positively charged, neutrons have no charge at all and electrons are negatively charged. The proton-to-electron ratio is always on e to one, so the atom as a whole has a neutral charge. For example, a carbon atom has six protons and six electrons.

An atom's properties can change considerably based on how many of each particle it has:

• The number of protons in an atom determines the type of element. Elements are classified by their atomic number, which is simply the number of protons in an atom's nucleus. Some common elements on Earth are oxygen, carbon and hydrogen.
• There are different types of atoms called isotopes. These isotopes look and act the same in nature -- the only difference is the number of neutrons in the nucleus.
• You can calculate the “mass” of an atom by counting the number of protons and neutrons inside the nucleus. This number is called the example -- carbon-12 (six protons + six neutrons), carbon-13 (six protons + seven neutrons) and carbon-14 (six protons + eight neutrons).

If atoms are so small, then how can they release the kind of energy that creates an atomic bomb? Find out on the next page. 

Top 5 most deadly Animals

Place 1:The MosquitoDue to malaria carrying parasites transferred by the mosquito, it is responsible for the deaths of more than two million people per year. In addition, Mosquitos are estimated to transfer diseases to more than 70 million people per year. Even in countries such as the UK, New Zealand, and Japan, where the more temperate climate has reduced mosquito bites to mostly an annoyance, they still cause some deaths every year.






Place 2:Asian CobraWhile the Asian cobra does not have the deadliest venom, it does make the most of what it has, causing the largest chunk of the 50 thousand deaths by snakebite per year. An average cobra is about 1 metre in length.










Place 3:Great White Shark
This shark is an exceptionally large shark found in coastal waters in all major oceans. It can reach lengths of up to 6 metres and can weigh up to 5 tons. The Great White Shark is the worlds largest known predatory fish. It is the only surviving species of its genus. In general these creatures do not attack humans, and (while there have been some fatalities) the majority of attacks on humans are believed to be test bites - the Great White Shark are known to test bite other objects in order to determine what they are. More people are killed each year in the US.


Place 4:African LionThe African Lion can reach up to half a ton. Lions are thought to kill up to 70 humans per year in Tanzania. These large animals are eclipsed in size only slightly by the tiger.








Place 5:Poison Dart FrogThe backs of the poison dart frog ooze a slimy neurotoxin that is meant to keep predators away. Each frog produces enough of the toxin to kill 10 humans, though, strangely, in captivity, the frogs do not secrete this poison. The frogs are brilliantly coloured and live mainly in Central and South America













Huh not scarry but dangerouse :-s:-s...:P

Crysis Warhead was declared best PC game

Crysis Warhead was declared best game in 2008

About:
Take on the fight as the volatile Sergeant “Psycho” Sykes in a new parallel story taking place during the events of Crysis. Psycho’s secret mission will take him to the other side of the island on a ruthless pursuit of a North Korean general hell-bent on obtaining powerful technology. With the versatile powers of his Nanosuit and an arsenal of fully customizable weapons & vehicles at his disposal, Sykes will do whatever it takes to carry out his top-secret objective.
Action on the other side of the island is more intense, the battles are fierce, and the mission protocol is no longer “Adapt to Survive”. As Sergeant Sykes, now you must adapt to dominate the battle. Twin SMG’s blazing, seizing new vehicles, or going stealth, the action and the victory is on your terms.

Screenshots:

HuH a realley nicee game!:)

Best MotorBike

Harley Davidson V-Rod Muscle

Harley Davidson has introduced a new member of the V-Rod family, the V-Rod Muscle. The look is new with somewhat angular bodywork and exhaust pipes that exit on both sides of the bike.
1250cc Revolution V-Twin: Standard on all 2009 VRSC models, the 60-degree Revolution 1250cc V-Twin is liquid-cooled and features Electronic Sequential Port Fuel Injection (ESPFI), dual overhead cams, four-valve heads, and a five-speed transmission. The engine is rubber-mounted in a hydroformed steel perimeter frame. A shell covers the large-volume airbox located over the engine. A five-gallon fuel tank is located below the seat on all VRSC models. The engine is tuned to produce up to 125 hp at 8250 rpm and up to 85 ft-lbs. of torque at 7000 rpm.

Most expensive PC

A very interesting post over at Wired has listed the most expensive PC’s available till date. The list features Dell’s $10,000 collector’s edition PC, $24,000 Voodoo PC that has 2 terabytes of storage, 4GB of RAM and an AMD FX-60 dual core processor, $21,000 Apple G5, $5,000 luxury gamer’s Alienware PC, $17,000 Mach V, $355,000 diamond encrusted Tulip E-Go notebook, $55,000 Truvia EPC and $800,000 Decadent multi-screen display that offer combinations of up to 64 HD screens. So, if you feel like splurging then you have now got the best options to choose from!!!

Top 10 most expensive cars

Place 1: Bugatti Veyron

Bugatti owner Wolskvagen he proposed to produce the fastest car series thus taking birth Bugatti Veyron, ranks in the top 1 of the most expensive cars in the world series.
Buggati Veyron hiding under the hood a massive 16 V aluminum and magnesium with a cylinder capacity of 8 liters located behind soferului.Acesta has four valves per cylinder, the total reaching 64-valve, Veyron having 1001 horsepower or 736kW in 6000 rpm more than four Subaru WRX at a place.
But speed is a semi-manual in seven steps, the shift in another step up durand only 0.2 seconds.
As Veyron size measured 4.5 meters long and 2 meters wide and the maximum speed is over 450 km / hour, reaching 100 km / h in just 2.9 seconds. In order to achieve such performance Veyron uses cauciucirile with Michelin Pax system able to support stress speed over 400 km / hour.
Price without taxes is 1,000,000 euros




Place 2:Pagani ZondaProduct manual in only 40 units Pagani Zonda is truly "a macchina con anima" as he described a founder Horacio Pagani Pagani car. Each of the 40 units will be created only after the requirements for prospective owners incercandu to achieve a level of personalization.
Zonda incorporates an engine of Mercedes Benz AMG 7.3-liter that develops 555 horse power and the ABS / traction control. Rims are forged from a single block of aluminum and its tires 255/35/19 and 345/35/19 have been specifically created for Zonda by Michelin.
The gear box has been created specially for the Pagani cima and benefit from experience of this company in time to race in F1.
Price without taxes of Pagani Zonda is 561,000 euros.



Place 3: SSC Ultimate AeroPresent in the top 10 fastest cars in the U.S. series is the SSC Ultimate Aero car that managed to record dodoare owned by Enzo Ferrari in Road & Track slalom course reaching the average speed of 118 km / hour.
Rims Ultimate Aero's were created in collaboration with hre Wheeles and it would be supposed to happen because Aero reach speeds of up to 439 km / hour. Corvette engine is a modified and equipped with the supercharger that develops 6950 rpm at 1046 horse power, the MSA is down almost a CP per kg.
Price third occupant is 550,000 euros.


Place 4: Leblanc Mirabeau
Designed to meet standards FIA / Le Mans mirabeau Leblanc is the latest creation of Swiss company Wysstec.
Propulsorul is the same V8 as the CCR Koenigsseg has Lysholm Screw Compressor, the higher centrifugal compressor that allows achieving a maximum speed of 370 km / hour is one the fastest Ditrău well understood one of the most expensive cars in the world. Koenigsseg V8 turbo engine is equipped with supercharger, has a capacity of 4.7 liters and develops 700 horsepower. The interior is Spartan one specific car racing but the company is preparing to provide personalization and a variant of the interiors.
Mirabeau Leblanc's price is 543,000 euros, a price that ranks in the top 5 most expensive cars in the world series. euros.


Place 5:Sallen S7 Twin TurboA true super car Saleen S7 is capable of achieving speeds over 321 km / hour and from 0 to 100 km / h in less than three seconds. Propulsorul of Sallen is a V8 with two stainless steel valves and a capacity of 7.0 liters that develops 6300 rpm at 750 horsepower.
Rims are aluminum with a diameter of 19 inches on the front and 20 inches rear and Pirelli performance tires are Michelin Pilot Sport PS2. Chosen Brembo brakes are discs with a diameter of 15 inches on the front and 14 inches back. Saleen's exterior was designed for a cat better aerodynamics and increased by 60% the effect of soil.
Interior surfaces are covered with quality leather and air conditioning is not missing.
Rate this super American car reaches 535,000 euros which is why place in the top five most expensive cars in the world series.


Place 6:Koenigsseg CCRKoenigsegg CC8S prestigious model now has a new competitor on the CWC, model with the best note in Chapter design, aerodynamics, braking capacity and the first chapter horsepower. Propulsorul's CCR is a wrought aluminum V8 that develops 806 horsepower at 6900 rpm with the help of the CWC which reaches speeds of over 395 km / hour and develops a maximum torque of 920 Nm. Acceleration from 0 to 100 km / h is done in only 3.2 seconds and grutatea total of 1180 kg lead to a good report weight / power.
The engine is positioned behind, positioning specify coupe design and transmission is on the rear deck is also present and the traction control.
Bodywork is carbon fiber obtained using the last proceed to remove the impurities from the composite material.
Inside or not at all Spartan Sports and continue the line from outside customary leather upholstery.
The purchase price for this super car is 458,000 euros, being in a well deserved rating instead 6.

Place 7:Mercedes SLR McLarenSLR McLaren Mecedes enjoy all the experiences of German car manufacturer for years.
Propulsorul SLR McLarenm's V8 is a surcharge of 5.5 liters and 626 HP with a maximum torque of 780 Nm, centrally-mounted front. Transmission is only available in automatic version, with three programs: Comfort, Sport and Manual, with the possibility of changing the stairs buttons located on the wheel. The price model is directly proportional to performance. If you want more, you can try the alternative proposed by Brabus with 660 HP engine that provides a better start, 3.6 seconds to 100 km / h and a maximum speed of 340 km / h. Price of SLR is the measure: 380,000 euros.


Place 8:Maybach 62

Maybach 62 is an ultra-luxury sedan made by Mercedes Benz.
This limo is propelled by a V12 engine of 5.5 liters and 550 horsepower and its maximum speed is limited electronically to 250 km per hour.
Maybach is top in terms of the luxury segment, including equipment lists his Maybach is a Dolby Surrownd 600 Watt, climate control system with four zones and two separate systems of air conditioning, DVD players, TV, fridge box, telephone cordless, everything necessary for passenger comfort.
Design Maybach 62 is a combination of classic and innovative, "refinement" is the base word to describe. The materials used are of the highest possible quality of interior space and 2.68 meters long and 1.57 distance between the front seats and the rear is a step forward in terms of comfort. Maybach 62 practically redefines the notion of luxury and well it comes with a cost per measure: 376,000 euros.


Place 9:Porsche Carrera GT

Presented for the first time in 2004, Porsche Carrera GT is a roadster on how attractive the design so ingenious technical.
V10 engine or the 605 horsepower engine that is created in Weissach, Germany for racing, with the mention of the GT was increased capacity to 5.5 liters to 5.7 liters. The 605 horsepower of his are "released" at 8000 rpm and maximum speed is 330 km / hour. Carrera GT accelerates from 0 to 100 km / h in only 3.9 seconds.
Carrera GT is one of the most successful models from Porsche, and managed to win a special place in history 57 years of Porsche. Its qualities and brought prestige and worldwide wheel automobilistica won Gold, and Best Car Auto Trophy in Germany.
Rate this magnificent roadster is "only" 370,000 euros.


Place 10:Maybach 57 SMaybach 57 S manages to combine in a unique luxury and dynamism. It is dedicated primarily to those who want to drive personally, this model offers both performance and comfort. 57 S's engine is a Mercedes AMG 6.0 liter V12 from bi-turbo that develops up to 612 horsepower engine and a torque of 1000 Nm available between 2000 and 4000 rpm. Acceleration from 0 to 100 km / hour of 2735 kg is made in 4.9 seconds but the maximum speed is limited electronically to 275 km / hour.
Each engine is hand assembled by one person and the name of the technician responsible motor assembly is located on the engine model in each hand.
Exterior design suggests dynamism, jente impression accentuated by 20 inches with spite and grille with aggressive design in front.
Inside of 57 S enjoy that same luxury Maybach has accustomed us, that luxury of course comes with a price as in the case of Maybach 57 S 362,000 euros.

The 10 Most Powerful Billionaires

1 Bill Gates $40.7 billion Rank: 1

Microsoft's operating software drives 93% of the world's desktop computers.  The world's richest man is also its biggest giver: more than $1 billion annually, much to vaccine research.

2 Warren Buffett $30.5 billion Rank: 2

The Oracle of Omaha owns 36% of Berkshire Hathaway, a property/casualty company with an immensely profitable sideline managing its portfolio of stakes in blue chips like Gillette, Coca-Cola. Vows to leave his wealth to charity.

3 Silvio Berlusconi $5.9 billion Rank: 45

Italy's prime minister owes much of his influence to Fininvest, his investment firm that owns 49% of Mediaset, Italy's largest television network. He also has  interests in banking, insurance and publishing.

4 Rupert Murdoch $5.5 billion Rank: 54

While rivals circle the drain, Murdoch's News Corp. remains buoyant on hits  like Fox TV's Joe Millionaire. The media baron's empire also includes  movies and publishing, but satellite television gives him his global  reach. He hopes to have better luck in the second round of his prizefight  for satellite broadcaster DirecTV.

5 Li Ka-shing $7.8 billion Rank: 28

Centered on the conglomerate Hutchinson Whampoa (telecom, port services, real estate), Li's empire spans 41 countries and accounts for 13% of Hong Kong's stock market value. Asia's richest man has invested $7 billion in Mainland China and built 400 miles of roads and bridges.

6 Prince Alwaleed $17.7 billion Rank: 5

This Saudi prince's influence reaches far beyond the Middle East.  Citigroup's largest individual investor has met with heads of states of more than 20 countries, including Russia, the U.K. and China.

7 Mikhail Khodorkovsky $8 billion Rank: 26

Head of Russia's second-largest oil company, Yukos, helps  keep world energy prices down by boosting oil exports in face of OPECprotests. Russia's richest man is also leading  the charge in making the country's murky business affairs more transparent.

8 Robson Walton $16.5 billion Rank: 7

Eldest son of Sam Walton controls family's 38% stake in Wal-Mart,  the world's largest retailer: some 3,200 stores in the U.S., nearly 1,200 stores abroad. Sales: $244 billion. The company might beef up its European presence with a bid for U.K. grocer Safeway.

9 Carlos Slim Helú  $7.4 billion Rank: 35

Known for his investments in U.S. retailers like Saks and Circuit City, Helú also has holdings representing a third of the Mexican Bolsa. He is plowing millions into rejuvenating Mexico City and has hired Rudolph Giuliani to curb the city's crime. He is also tight with Mexico's top political up and comers.

10 Azim Premji $5.9 billion Rank: 45

Owns 84% of Bangalore-based Wipro, India's largest technology concern. Wipro is a leader in the lucrative business of shifting white-collar jobs from the U.S. and Europe to Asia.

The fire evacuation in the school

The school organized a fire evacuation and invited the firefighters to show us how they proced when the fire isn't under control or how they save someone when the building is in fire etc.

 We went outside and this are some pictures of what i saw hope u like them:

(i will post a video made by a friend as fast as i can)