Wednesday, March 7 | 9 pm eastern | 6 pm pacific |Virtually Speaking Science | Who is John Carter and what have we learned about Mars in the past century? MSNBC’s Alan Boyle (Cosmic Log) talks with JPL Chief Scientist, Mars Exploration DirectorateDave Beaty.  VS Science is produced in cooperation with MICA. Follow @b0yle Watch for the pre-show interview at CosmicLog.Listen live and later on BTR