Criminals who fire guns could soon be caught red-handed. A UK team has developed tiny sticky tags that are coated onto a gun cartridge and attach themselves to the hands or gloves of anyone who handles it. The 30-micrometre “nanotags” consist of pollen coated with titanium oxide, zirconia, silica or other oxides, in proportions that can be varied for each batch of cartridges to create unique identifying signatures.
A system that can automatically recognise the bird species singing in a given neck of the woods has been developed by computer scientists at the University of Bonn in Germany. The…
