Upright stand, making

In the lead plate test of detonators, the detonator is fired while standing upright on a plate of pure lead. Plates 2 to 6 mm. thick are used, most commonly 3 mm. A good detonator makes a clean-cut hole through the lead. The metal of the detonator case is blown into small fragments which make fine and characteristic markings on the lead plate radiating away from the place where... 

In this group of compounds the molecules are found lying flat and standing upright it is also possible, by eliminating the hydroxyls at 16 and 17, leaving only that at 3, to make the oestratriene skeleton stand upright on the other end, i.e. on the same end as the commoner sterols. 

A beaker (below left) is a cylindrical cup with a notch at the top. Beakers are often used for making solutions. An Erlenmeyer flask (below center) is a conical flask. A liquid in an Erlenmeyer flask will evaporate more slowly than when it is in a beaker and it is easier to swirl about. A round-bottom flask (below-right) is also called a Florence flask. It is designed for uniform heating, but it requires a stand to keep it upright. 

We are humans. We are bipedal and stand upright. We have hands, feet, fingers, and toes. You can look at the student next to you and easily recognize that person to be human too. What makes us look similar to each other while different from frogs, fish, or fuchsias is the molecule deoxyribonucleic acid (DNA). 

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