XXI Community of Bloggers
May Day, also known as International Workers’ Day, is a traditional holiday celebrated on May 1st in many countries around the world. It is a day to honor the achievements of workers and to advocate for their rights. The origins of May Day can be traced back to the late 19th century when labor movements […]
A team of researchers from the Massachusetts Institute of Technology empirically selected the shape of a toroidal screw, which creates the lowest sound volume in the frequency range of 1-5 kHz. This is the most sensitive area for the human ear – babies cry at this frequency and nasty multicopter motors screech. The latter became […]