Franken-concrete comes to life to create self-healing buildings.
A team of American researchers has developed a new kind of biological concrete that could redefine what we mean by “green buildings.”
The concrete, developed by researchers at the University of Colorado, Boulder, uses bacteria as a binder. This leads to a material that can grow and even heal itself — much like a living organism.
An arch made from living building materials, next to the bacteria used to make it. (CU Boulder College of Engineering & Applied Science)
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In traditional concrete, sand and aggregate are bonded together with cement.
In this biological concrete, photosynthetic cyanobacteria take the place of cement. The bacteria use carbon dioxide from air to produce a material similar to limestone that glues together sand particles, making robust building blocks.
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The dust-shrouded objects may be binary stars merging as they orbit the supermassive black hole in our galaxy’s core.
An illustration of the orbital paths of the six known G-objects around the supermassive black hole in the center of the Milky Way. Anna Ciurlo, Tuan Do/UCLA Galactic Center Group
Astronomers have discovered four new and mysterious objects orbiting the Milky Way’s supermassive black hole, Sagittarius A*. The bizarre objects look a lot like common clouds of gas and dust, but they surprisingly manage to stay compact like stars as they run laps around our galaxy’s gargantuan black hole.The quartet of new objects share striking similarities with two others, dubbed G1 and G2, that were found in the past 15 years or so. This has led researchers to conclude the four new bodies likely belong to the same class of objects as G1 and G2, which are simply referred to as G-sources or G-objects.
Researchers don’t yet know exactly what these G-objects are, but they think the strange bodies might be binary stars in the process of merging.
