Real physical waves, such as light beams, spread, diffract, scatter and interfere in complex and chaotic ways. An intriguing consequence of this is are 'singular' features of waves, such as optical ...

What is a Kondratieff wave? It is the central concept in a controversial but intermittently fashionable theory of economic history, which holds that major capitalist economies tend to grow ...

With your acceptance, your precise location (within a radius of less than 500 metres) may be used in support of the purposes explained in this notice. List of IAB Vendors‎ Actively scan device ...