Ohrožuje i nás tající ledovcová pokrývka?

summary:In recent years, scientists and politicians have discussed who or what is responsible for global warming. In the paper based on the facts of reducing ice cover around the poles, we create various scenarios (model situations) and look for consequences to which the observed phenomena may lead. Does global warming threaten humanity

Co může způsobit sedm miliard lidí?

summary:Around the year 1810, there were about one billion people on the Earth and nature was in balance. There were no heat power-stations and no transport by heat engines. Today, there are 7 billion people on the Earth, who increase the quantity of carbon dioxide by their activity and who contribute to global increase of temperature. There are models of situations on secondary school level to obtain concrete idea about consequence of the global increase of temperature

Mezinárodní rok astronomie

summary:The article describes the activities held during this year which has been proclaimed the International Year of Astronomy. It also contrasts the important role of astronomy in human development with its marginal position in secondary school curriculum

Padesát let práce se zájemci o fyziku

summary:The author describes some problems that have occurred in the fifty year history of Physics Olympiad in the Czech (or Czechoslovak) Republic

Ostrov Robinsona Crusoe

summary:The author returns to his youth, when he read the book about Robinson Crusoe and tried to find in maps the island, where the main character spent several years after the shipwreck. It turns out that the fortunes of the real sailor Alexander Selkirk were slightly different and took a slightly different place