On a certain illusory strategy for survival.

The hustle-and-bustle of our everyday lives generally prevents us from noticing the fierce, life-and-death battles quietly paying out around us, as incoming "invaders" ruthlessly conquer native species of plants and animals. Can we cope with this problem?

The megaliths of Nabta Playa are an expression of an elaborate Late and Final Neolithic ceremonialism unprecedented in Africa. The ceremonial center of Nabta Playa supplies evidence that at least some of the roots of Ancient Egyptian beliefs, magic and religion lie buried in the sands of the South Western Desert.

A dual-wavelength optical polarimetric approach has been proposed as a means of elimination of the systematic errors and estimation of the optical anisotropy parameters for a single DKDP crystal. Our HAUP-related polarimeter uses two semiconductor lasers with the neighbouring wavelengths of 635 nm and 650 nm. Based on the temperature dependence analysis of small characteristic azimuths of light polarization with respect to the axis of the sample, we found the parameters of imperfections of polarization system. We acquired eigen waves ellipticities in a DKDP crystal and found perpendicular to the optic axis value of the optical rotatory power. Our results correlate positively with previously measured data for KDP crystals.

Cywilizacyjny zgiełk skutecznie zagłusza rozgrywającą się za naszymi plecami walkę na śmierć i życie: najeźdźcy, którzy czują się świetnie na nowych terenach, nie oszczędzają rodzimych gatunków roślin i zwierząt. Jak można zmierzyć się z takim problemem?