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By James N. Pitts, etc.

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My favorite is the October 23, 1998 cover of Science magazine, the “Genome Issue”: (Permission for use granted from Science magazine. ) 24 The Mirror Image Summary Our world is full of chiral objects from the microscopic molecular to the macroscopic! This is a simple and obvious conclusion that everyone in our world can make. However, it takes more work and thought to define and communicate the exact (absolute) three-dimensional structure of objects in our world. In certain situations it suffices to know that something is chiral, but a complete understanding of biological and chemical processes requires that one be exact in the articulation of chiral structures.

One, and the unit repeats with every fourth tetrahedron. 7 we show a segment of SiO2 chains and on the left and right, the arrangement of the helical chains looking down the axis of the helix. We have tried to indicate depth by decreasing the font size of the atoms shown. In this figure, one has to imagine a very complex interconnected structure with every Si attached to four O atoms, and every O atom attached to two Si atoms. Clearly, Pasteur was correct in stating that the molecular building blocks of this structure are not chiral, but simply arrange themselves in a chiral (helical) form.

This design serves to compensate for a force that would tend to cause the airplane to twist, and thus makes their airplane net achiral. In modern airplanes with two or more propellers, the propellers all turn in the same direction. This is convenient, of course, since the airplane mechanic doesn’t need to worry about the side of the plane on which the engine is being installed. Modern airplane control systems are much more sophisticated than those of the Wright brothers, and it is easy to compensate for any net twisting force because all the propellers are turning in the same direction.

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