Article describing the discovery of rhenium and technetium by Walter Karl Friedrich Noddack and Ida Eva Noddack-Tacke. Information regarding pertinent locations is included.

Article describing Axel Fredrik Cronstedt and his discovery of nickel. Information regarding pertinent locations is included.

We are investigating the technical feasibility of injecting CO2 for carbon sequestration with enhanced gas recovery (CSEGR) in the depleted Altmark natural gas reservoir, Germany. Our approach is numerical simulation using TOUGH2/EOS7C. Our earlier simulation studies have shown early CO2 breakthrough due to fast-flow through the high-permeability sand layers. In order to extend the period of enhanced CH4 recovery, we propose the preinjection of gelling fluids for the purpose of limiting the mobility of injected CO2 and thereby improving CO2 sweep and delaying CO2 breakthrough. We have implemented a simple gel model into EOS7C and simulated gel injection followed by CSEGR.Preliminary simulations to date show minimal improvements in CSEGR with breakthrough times delayed by only a few months to a year. While mobility control using pre-injected gelling fluids appears to be a promising strategy in controlling early breakthrough, more work is needed to design and simulate an effective procedure.

Article describing the discovery of niobium and tantalum. Tourist information regarding locations significant to these discoveries are included.

Article recounting the history of the element Germanium, including background material on mining in Germany and the isolation of Germanium by Clemens A. Winkler. Tourist information is provided regarding Winkler's laboratory and mines open to the public as museums.

Article describing the career and discoveries of Carl Wilhelm Scheele. Tourist information regarding locations important to Scheele's life are visited and discussed.

Article describing the discovery of phosphorus in 1669 by an alchemist searching for the philosopher's stone, and its use a century later by Lavoisier to help usher in the era of modern chemistry. Tourist information regarding sites pertinent to this history are included.

Article describing the history of atomic weight and the events leading up to the Karlsruhe Congress of chemists. The authors visited several sites pertinent to these events and offer tourist information.

Article describing the life of Johann Wolfgang Döbereiner and his attempts to systematically organize the elements. Tourist information regarding locations significant to his history is included.

Article describing the history of aluminum, from its use in alum to its isolation. Tourist information is given regarding locations pertinent to aluminum.

Article describing the career of Robert Bunsen and the history of spectroscopy and its use in mineral analysis. The discovery of cesium and rubidium using spectroscopy on mineral water is included. In addition, the authors offer tourist information regarding locations pertinent to Bunsen and certain mineral water springs.

Article explaining the front cover of issue 3 of volume 99 of The Hexagon, which features a painting of mice around a Bunsen burner. James Marshall discusses the picture and how it relates to the history of chemistry.

Article describing the life and career of Martin Heinrich Klaproth, including his discoveries of uranium and zirconium. Tourist information regarding locations significant to his history is included.

Article recounting the history of the development of the Periodic Table. Sites pertinent to this development were visited by the authors, who provide related tourist information.

Article describing how vanadium was "rediscovered" in Sweden and found to be identical to del Rio's sample. Includes tourist information regarding areas relevant to this portion of vanadium's history.

Article describing the rise and fall of the eighteenth century idea of phlogiston. Tourist information is provided regarding pertinent areas of phlogiston's history.

Article describing the importance of the Harz Mountains and the University of Göttingen in the discovery of cadmium and thallium. Tourist information regarding the area is included.

Article providing a short summary of a representative survey on near-death experiences (NDEs) in Germany, which is the first of its kind in Europe. The researchers tested several assumptions derived from previous research on NDEs, including the assumptions of a unified pattern of experience, the universality of the pattern, and the necessary link between NDEs and clinical death.

This article chronicles William T. Ponder's training and testing in battle against the backdrop of World War I aviation history. Ponder served with the French Aviation Service as part of the Lafayette Flying Corps and the U.S. Air Service where he became Oklahoma's first aviation war hero.

Article describing the career and discoveries of Georgius Agricola. Tourist information regarding locations important to his life are visited and discussed.

Front cover of volume 100, issue 1 of The Hexagon, featuring the multistory brick and stone church, Nikolaikirche. The church's first several floors are comprised of older stone work while the upper stories use newer red brick. People and vehicles are on the street near the church, and a row of buildings can be seen in the background to the left. The magazine's logo is printed over the church's bluish roof spires. The inside cover contains a table of contents, staff credits, and an editorial.

Front cover of the Winter 2009 issue of The Hexagon, featuring a man in a Berlin shirt riding a bicycle laden with large pretzels. A small dog on a leash follows alongside of him. The inside cover has a table of contents, a list of staff, and an editorial.

Front cover of the winter 2010 issue of the Hexagon, which features a sculpture of a bearded head. The inside cover includes a table of contents, a list of staff, an editorial, and a description of the cover.

Front cover of the spring 2012 issue of The Hexagon, featuring the pharmacy at Quedlinburg, Germany, where Martin Heinrich Klaproth was trained. The three story building is pinkish with white trim around its windows. A triangular stone piece with the image of a flying bird sits on the third floor over the entrance. The inside cover of the magazine contains a table of contents, staff listings, an editorial, and a description of the building.