The hidden structure of the periodic system

A slightly different periodic table: The table of chemical elements, which goes back to Dmitri Mendeleev and Lothar Meyer, is just one example of how objects – in this case the chemical elements – can be organized in such a system. The researchers from Leipzig illustrate the general structure of a periodic table with this…

A-level maths paper leaked online before exam

An investigation has been launched after an A-level maths paper was circulated online before the exam. Images of the test paper by Edexcel appeared on social media on Thursday afternoon. The exam board’s parent company, Pearson, said the images “were circulated in a very limited way” before students sat the exam on Friday. “Having visited…