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Most arguments on early gunpowder developments now revolve around how much Chinese advancements in gunpowder influenced gunpowder warfare in the Middle East and Europe, but controversy over gunpowder's precise origins continue to be debated today.Gunpowder is classified as a low explosive because of its relatively slow decomposition rate and consequently low brisance.Gunpowder thus makes a good propellant, but is less suitable for shattering rock or fortifications.Red blood cells - the color comes from iron in hemoglobin. If you grew x 10,000, you could place your feet in Seattle and touch Perth, Australia with your hands.Iron in hemoglobin carries oxygen around our bodies. Close up of an iron meteorite: Meteorites such as this one were probably our ancestors’ first source of iron.This is a fragment of the Sikhote-Alin meteorite – approximately 93% iron, 6% nickel and 1% other elements.With our handy Online Design Tool, you can create almost anything you envision. Type a message in the text box, then choose from font selections to make it your very own. You can design one side only, or both front and back.Our Online Design Tool makes the whole process quick and easy. And, if you like, you can even ask us to view your design and provide technical assistance to help you achieve exactly the look you are striving for..any point in the process.

For example, carbon-12, carbon-13 and carbon-14 are three isotopes of the element carbon with mass numbers 12, 13 and 14 respectively.

All isotopes of a given element have the same number of protons in each atom.

From left to right, the isotopes are protium ( Isotopes are variants of a particular chemical element which differ in neutron number.

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Gunpowder, also known as black powder to distinguish it from modern gunpowder, is the earliest known chemical explosive.