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A business class passenger on an Avianca flight experienced a sour taste in his mouth. He recently took to the Internet to share his experiences of unclean toilets, packaged desserts, and breakfasts “served in economy class containers.” The priesthood may not say “no one has the wrath of a business class passenger scorned” but he really had to. Why? A spiky late passenger recently took to the Internet with another hit from his London-Bogota flight Avianca 787, where the experience failed to live up to its bill as a premium service. A “comically bad” experience stabbed by avid traveler Matthew Klint, who writes for aviation websites Jump & Let’s Fly . Klint recently flew Avianca, a Colombian airline that has been the flag carrier of Colombia since December 5, 1919, when it was originally registered under the name SCADTA. Even though Avianca isn’t well-known as one of the world’s leading luxury airlines (for airlines that have the best bu...

figure: This image depicts the formation of the second layer in a heterolayer coordination nanosheet. The cobalt ions pass through a pre-existing first layer (consisting of the iron coordination center and the pyridine ligand), which has formed at the liquid-liquid interface between water and dichloromethane. They then assemble into a coordinated layer by combining with the pyridine ligand. see again Credit: Hiroshi Nishihara of Tokyo University of Science The last few decades have witnessed a large amount of research in the field of two-dimensional (2D) materials. True to its name, this thin-film-like material consists of layers only a few atoms thick. Many chemical and physical properties of 2D materials can be adjusted, leading to promising applications in many fields, including optoelectronics, catalysis, renewable energy, and more. Coordination nanosheets are one of the most interesting types of 2D materials. “Coord...