Český klub skeptiků Sisyfos

Its primary goal and mission is to spread and defend the findings and results of contemporary science, to promote rational, critical thinking, to acquaint the public with the principles of scientific method, to speak out against the spread of paranormal ideas and unproven procedures, to ensure that universities, scientific societies and institutions are actively responsible for defending science and critical thinking, to investigate controversies and false claims, to provide assistance to citizens in protecting against fraudulent products and ineffective or dangerous alternative medicine products and healing methods.

[3] The organisation issues an anti-award called Bludný balvan (Erratic Boulder) "to highlight the contribution of individuals and societies in misleading the Czech public and the development of a muddy way of thinking.

The Congress included lectures and panels, and involved discussion on topics such as science and religion, exorcisms and genetically modified organisms.

Free, public workshops also ran during the Congress on topics like "Quantum Mechanics vs Common Sense", "What can we infer from children's drawings", and "Mission to Mars".

[10][11] After an internal debate among the members, in February 2001 the organisation finally decided that, for practical reasons, it will not deal with religious issues.

James Randi performs a card trick at a 2017 Sisyfos event in Prague .
Claire Klingenberg explains Sisyfos' paranormal challenge (2017).