Today it is widely accepted among philosophers ofanalytical inclination that there are two theoriesabout what endows words with their extensions: thetheory of natural kinds and the so-called Californiansemantics. It is widely agreed that the first issuperior to the second because it can not only explainthe indexicality of the extension of natural kindterms as well as their social character but also avoidGoodman''s paradox of projectibility. Natural kindterms can not be corrupted concepts since theirmembers are grouped by objective similarity.It will be shown (...) that there is a third way besidesthe two above-mentioned theories. It shares theadvantages of Natural Kind theory without making useof the problematic concept of objective similarity.Its main feature is not to claim that extensions arethere once and forever but that concepts evolve byusing concepts. (shrink)

Frederick sits in a rowing boat trying to fight against the heavy waves of the sea. His small arms move in the wind like swords. He stares at the crests of foam while his parents sit on the beach. They look constantly at the boat which dances on the waves. After a little while they read calmly in the newspaper, because the wind is drifting Frederick toward the beach. There are many children playing with their boats and their surf-boards.

I think that the international movement of doing philosophy with children consists of two main lines: the first line aims at elementary and seconday school philosophy and the second line aims at philosophy as an after-school enrichment. I'm mainly engaged in doing philosophy with children outside school.