The new filter is made of Polylactic Acid and Bismuth Ferrite uses piezo-photocatalysis, which combines the principles of piezocatalysis and photocatalysis to enhance the degradation of pollutants and other chemical transformations. 

Researchers from Czech Technical University in Prague, Czech Republic, Indian Institute of Technology, Delhi, India, and Northumbria University, UK are studying relay-assisted visible light communications to improve the indoor coverage of mobile network connectivity. Their new technique turns mobile phones into relays, forwarding data from the transmitter to the end user.