Holding that expert testimony was inadmissible based on its unreliable methodology notwithstanding "the impressive qualifications of plaintiffs' experts"
Holding that, in order to avoid summary judgment, the plaintiffs in a FELA action were required to produce expert testimony that exposure to chemicals played a part in causing their injuries
Finding that a plaintiff must show "but for the alleged malpractice, it is more likely than not that the plaintiff would have obtained a more favorable result"
Holding that a right to damages is substantive and governed by state law in a diversity action because the remedy "is inseparably connected with the right of action"