Modern Engineering Marvels on MSN

Ancient tooth plaque is rewriting the human family tree

Dental calculus is the richest known source of ancient DNA in the archaeological record. That stubborn mineralized plaque, once treated as little more than an unpleasant byproduct of life, has become ...
Princeton University

PHI 201, Lecture Schedule

Formation rules Induction on formula complexity Semantic methods: Truth tables, partial truth tables, trees Reading: Lemmon pp 41-49, 64-74 Validity in virtue of quantifier structure Elementary ...