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John Mathews does not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment. Cement production is one of the dirtiest industrial processes on the planet. This increases every year with the extraordinary demands for building materials in China and India. But it is set to become much greener: cements and concretes of the future will sequester vast amounts of carbon dioxide CO 2 and utilise huge volumes of industrial wastes in the form of additives. Cement and the concretes made with it are about to become carbon negative — absorbing more carbon that they produce.

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Italian group claims to debunk Shroud of Turin

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Italian group claims to debunk Shroud of Turin

ROME - Scientists have reproduced the Shroud of Turin - revered as the cloth that covered Jesus in the tomb - and say the experiment proves the relic was man-made, a group of Italian debunkers claimed Monday. The shroud bears the figure of a crucified man, complete with blood seeping out of nailed hands and feet, and believers say Christ's image was recorded on the linen fibers at the time of his resurrection. Scientists have reproduced the shroud using materials and methods that were available in the 14th century, the Italian Committee for Checking Claims on the Paranormal said. The group said in a statement this is further evidence the shroud is a medieval forgery. In , scientists used radiocarbon dating to determine it was made in the 13th or 14th century. But the dispute continued because experts couldn't explain how the faint brown discoloration was produced, imprinting on the cloth a negative image centuries before the invention of photography.

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Research 'leader of the future' wins prestigious funding award

With an accout for my. Carbon atoms occur in heavy and light forms, or isotopes, and measuring the relative amounts of each can reveal the source of the carbon. Oxygen atoms are represented in gray and carbon isotopes are in orange. Scientists at the National Institute of Standards and Technology NIST have developed a laboratory instrument that will greatly reduce the cost of analyzing carbon isotopes.

Obsidian hydration dating or OHD is a scientific dating technique , which uses the understanding of the geochemical nature of the volcanic glass a silicate called obsidian to provide both relative and absolute dates on artifacts. Obsidian outcrops all over the world, and was preferentially used by stone tool makers because it is very easy to work with, it is very sharp when broken, and it comes in a variety of vivid colors, black, orange, red, green and clear. Obsidian contains water trapped in it during its formation. In its natural state, it has a thick rind formed by the diffusion of the water into the atmosphere when it first cooled—the technical term is "hydrated layer. That new rind is visible and can be measured under high-power magnification 40—80x.