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Light - is It a Wave or a Particle? Wave–particle duality!

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Wave–particle duality is the concept in quantum mechanics that every particle or quantum entity may be described as either a particle or a wave. It expresses the inability of the classical concepts "particle" or "wave" to fully describe the behaviour of quantum-scale objects. Can we accurately describe light as exclusively a wave or just a particle? Are the two mutually exclusive? In this third part of his series on light and color, Colm Kelleher discusses wave-particle duality and its relationship to how we see light and, therefore, color. You look down and see a yellow pencil lying on your desk. Your eyes, and then your brain, are collecting all sorts of information about the pencil: its size, color, shape, distance, and more.  But, how exactly does this happen? The ancient Greeks were the first to think more or less scientifically about what light is and how vision works. Some Greek philosophers, including Plato and Pythagoras, thought that light originated in ou
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SpaceX and NASA target first operational astronaut crew launch for late September

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  Image Credits:  SpaceX SpaceX   and NASA are aiming to launch the first official operational mission of the SpaceX Crew Dragon human-rated spacecraft sometime in September, the agency revealed via a media update this week. The launch had been tracking towards an August date, but the updated timeframe indicates “late September,” allowing time for the completion of the current Crew Dragon Demo-2 mission which will see astronauts Bob Behnken and Doug Hurley return to Earth using the SpaceX  spacecraft potentially as early as August 1. The Demo-2 mission, while it carried actual astronauts to the International Space Station, is actually the final step in the test and development phase of human-rating Crew Dragon and Falcon  9, meaning that they’ll then be qualified for regular service transporting astronauts in the eyes of NASA. Crew-1 is the first operational mission, meaning the first considered a standard part of SpaceX’s contract to provide regular astronaut transportation. SpaceX s
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How Do Quantum Computers Work?

WHAT IS QUANTUM COMPUTING? This branch of computer science is based on the principles of the superposition of matter and quantum entanglement and uses a different computation method from the traditional one. In theory, it would be able to store many more states per unit of information and operate with much more efficient algorithms at the numerical level, such as Shor's or quantum annealing. This new generation of supercomputers uses knowledge of quantum mechanics — the area of physics that studies atomic and subatomic particles — to overcome the limitations of classic computing. Although in practice, quantum computing faces evident problems regarding scalability and incoherence, it makes it possible to perform multiple simultaneous operations and eliminates the tunnel effect that limits current nanometric scale programming. Quantum computers perform calculations based on the probability of an object's state before it is measured - instead of just 1s or 0s - which means they ha
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