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Ever wondered how it feels like to hack a company? To breach their systems, traverse their network, and gain complete and total control of their domain - but all in bounds of legality? Well, look no longer! I've been scouring the inter-webs looking for decent resources that I can use to practice and hone

The spacetime diagram (“a position vs time graph”) is a valuable tool for modeling and interpreting situations in relativity. As I like to say, “A spacetime diagram is worth a thousand words.” Many problems and “apparent-paradoxes” (or better “puzzles”) can be resolved by drawing a good spacetime diagram. However, because Minkowski spacetime geometry is not Euclidean, there

Free Astronomy Books - Primarily for education.Feel free to add your own links to free books. Let me know if there are broken links or copyright issues.A New AstronomyA Popular History of Astronomy During the Nineteenth Century, Fourth EditionA Simple Guide to Backyard AstronomyAdvances in Modern CosmologyAstronomical DiscoveryAstronomy for AmateursAstronomy To-DayAstronomy of To-day A

Explanation: Can you find which day is the winter solstice? Each panel shows one day. With 360 movie panels, the sky over (almost) an entire year is shown in time lapse format as recorded by a video camera on the roof of the Exploratorium museum in San Francisco, California. The camera recorded an image every 10 seconds from before sunrise to after sunset and

Image Credit: NASA, Johns Hopkins U. APL, SwRIWhat do the moons of Pluto look like? Before a decade ago, only the largest moon Charon was known, but never imaged. As the robotic New Horizons spacecraft was prepared and launched, other moons were identified on Hubble images but remained only specks of light. Finally, this past summer, New Horizons swept right past Pluto, photographed Pluto and Charonin detail, and took the best