This an amazing medium has produced what appears to be good evidence for survival. What he did was very impressive and some of the phenomena is still trying to be explained by the skeptical community. The evidence includes paraffin casts of materialized limbs made in these seances. The paraffin casts still exists today and as late as in the previous episode of Skeptical Inquirer an article made a non-convincing attempt to debunk this phenomena.
More about Franek Kluski can be read here: