4) If observations, data, evidence, tests and experiments can't ultimately prove some hypothesis or conceptual model, then: (a) What can observations, data, evidence, tests and experiments ultimately do? (b) Thus, while both science (e.g., the U.S. Office of Naval Research, as co-created by UCSD's Roger Revelle) and pseudoscience (e.g., a lawyer-dominated tobacco-company-funded "research group") may attempt to gather evidence in support of some hypothesis, how does a valid scientific inquiry distinguish itself from pseudoscience? (Answer briefly in the context of our lecture material.)