The current financial and economic crisis is the worst since the stock-market crash of 1929. As with every complex phenomenon, a mixture of causes have been put forward: the housing-market bubble, risky mortgage loans, ‘toxic’ financial products, high personal and corporate debts, inaccurate credit ratings, and much more. The shockwaves have spread so rapidly and hit so hard that entire banking...

C and metallic bonding in solids profoundly impacts their properties, which have been widely exploited by humankind since ancient times. More exotic types of chemical bonding in solids are also known, for example, mixed ioniccovalent bonding characteristic of certain ceramics and perovskites. The basic classification of materials according to the type of chemical bonding in them goes together w...

We display a detailed description of mimetic muscles in extinct human species, framed in comparative and phylogenetic contexts. Using known facial landmarks, we assessed the arrangement of muscles of facial expression in Homo sapiens, neanderthalensis, erectus, heidelbergensis and ergaster. In modern humans, several perioral muscles are proportionally smaller in size (levator labii superioris, ...

We report how closely the Kohn-Sham highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) eigenvalues of 11 density functional theory (DFT) functionals, respectively, correspond to the negative ionization potentials (-IPs) and electron affinities (EAs) of a test set of molecules. We also report how accurately the HOMO-LUMO gaps of these methods predict the low...