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Wednesday, November 08, 2017

After a mass shooting at a church in Sutherland Springs, Texas, left 26 people dead Sunday, state Attorney General Ken Paxton suggested that institutions have to decide either to allow firearms or to hire private security to defend against future carnage. read more


Saturday, October 21, 2017

When the drinking water in Flint, Mich., became contaminated with lead, causing a major public health crisis, 11-year-old Gitanjali Rao took notice. She set about creating a device that could identify lead compounds in water, and was portable and relatively inexpensive. Her device consists of three parts. There's a disposable cartridge containing chemically treated carbon nanotube arrays, an Arduino-based signal processor with a Bluetooth attachment and a smartphone app that can display the results. The carbon nanotubes in the cartridge are sensitive to changes in the flow of electrons. Those tubes are lined with atoms that have an affinity to lead, which adds a measurable resistance to the electron flow. read more


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