This document includes questions and answers that pertain to the ARPA-E Funding Opportunity Announcement (FOA) entitled "Exploratory Topics - TOPIC M. H2SENSE".  The full solicitation on the Exploratory Topics - Targeted Topic M. H2SENSE FOA and additional information can be found on the ARPA-E Funding Opportunity Exchange website (https://arpa-e-foa.energy.gov).