Proximate and ultimate causation (current) Measure (mathematics) IO.SYS Unit impulse 2-Chloroadenosine String (formal languages) MT-LB Lists of Catholics Tereza Costa Rêgo Twisted Hessian curves Free Software Foundation Europe Andreev reflection Unalakleet River Classification of inhabited localities in Russia Response surface methodology Disappearance of Madeleine McCann Unit root Listing and approval use and compliance National Library of the Sovereign Military Order of Malta Samaritan Revolts Bivalve