A scientist and a philosopher answer listener questions on 'The National Conversation with All Things Considered,' NPR's nightly radio show about the coronavirus crisis. Excerpted here:- Aerobiologist Joshua Santarpia discusses disinfectants.- Professor David Chan talks through the day-to-day ethical dilemmas during the pandemic.If you have a question, you can share it at npr.org/nationalconversation, or tweet with the hashtag, #NPRConversation.We'll return with a regular episode of Coronavirus Daily on Monday.This episode was recorded and published as part of this podcast's former 'Coronavirus Daily' format.