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Like all elements, gold is an atom that gets its identity from tiny particles: positively charged protons in the nucleus, balanced by negatively charged electrons all around, plus neutrons, which have no charge at all. It's virtually indestructible, yet also soft and malleable.Did you know that radioactive material decays randomly?It's a story that begins with the Big Bang and eventually leads to us. Join me as I explore the basic building blocks of the universe… …to the least—manmade elements that last only fractions of a second; strange metals with repellant powers;… So, after all that pulverizing and crushing and weighing and firing, what we're left with is this? Eighteen hundred dollars times…720,000 bucks a truck! The surface mine produces less, about half an ounce per ton. This goes back to the 1800s, the late 1800s, where farmers were looking, actually, for money to plant their next year's crops. We use it for infrastructure; we use it for electronic goods. When times are bad, copper prices tumble, and when times are good, they soar. It's these free-flowing electrons that make metals conductive. Every day she receives hundreds of samples of earth taken from the mine. …then pulverized to the consistency of baby powder. But two rows above gold is another metal of antiquity that looms large in our lives: copper; symbol Cu; atomic number 29—29 protons, 29 electrons. Bronze helped to spur global trade, and, once forged into tools and weapons, it played a defining role in the empires of antiquity. I'm here because they're about to cast several bells.

Some types of radiation surround us every day and are perfectly safe, such as radio waves and visible light; other types, such as x-rays and gamma rays, can be dangerous to humans.The decay of radioactive materials is a random process, kind of like flipping a coin or rolling a die.Standard 3240-05 Students will investigate changes in Earth's crust and climate. The process of obtaining radioactive dates from samples is also shown.Learn how flipping coins can help you figure out how long radioactive material stays dangerous--in this fun (and perfectly safe) activity!Credit: George Retseck Key concepts Energy Radioactivity Exponential decay Odds Introduction One way of creating energy is with nuclear reactors.

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At embryonic stages CAR is uniformly localized on the plasma membrane of cardiomyocytes.

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However, it would be foolish to deny the impact they have had on society.