I'm an electronic engineer from Germany.

Some skeptics website I found so far:

Committee for Skeptical Inquiry: http://www.csicop.org/

Facts, Not Fantasy: http://factsnotfantasy.com/

The Skeptics' Guide to the Universe: http://www.theskepticsguide.org/

Skeptical Investigations: http://www.skepticalinvestigations.org/

The Skeptics Society: http://www.skeptic.com/

Skeptic's Dictionary: http://www.skepdic.com/

Gesellschaft zur wissenschaftlichen Untersuchung von Parawissenschaften (GWUP) e.V.: http://www.gwup.org/

An extraordinary claim requires extraordinary proof.
— Marcello Truzzi, On the Extraordinary: An Attempt at Clarification, Zetetic Scholar, Vol. 1, No. 1, p. 11, 1978

Extraordinary claims require extraordinary evidence.
— Carl Sagan

The weight of evidence for an extraordinary claim must be proportioned to its strangeness.
— Laplace

A wise man, therefore, proportions his belief to the evidence.
— David Hume