This document includes questions and answers that pertain to the ARPA-E Funding Opportunity Announcement (FOA) entitled "DE-FOA-0001953 Solicitation on Topics Informing New Program Areas Topic S - Topology Optimization and Additive Manufacturing for Performance Enhancement of High Temperature and High Pressure Heat Exchangers (Topology)".  The full Solicitation on Targets Informing New Program Areas FOA and additional information can be found on the ARPA-E Funding Opportunity Exchange website (https://arpa-e-foa.energy.gov/).