Dale.Amon@FAS.RI.CMU.EDU (01/10/86)
The most recent paper I have read indicates that the authors of the study feel they can refute the results of the paper claiming their findings are an artifact. Both papers appeared in Science Magazine sometime in the last year or two. Nemesis itself is in far greater trouble than periodic extinctions, even though periodic extinctions are far from being either proved or disproved.