<Tr> <Th> 51 </Th> <Td> 11 </Td> <Td> "The Maternal Congruence" </Td> <Td> Mark Cendrowski </Td> <Td> Story by: Lee Aronsohn & Steven Molaro & Richard Rosenstock & Maria Ferrari Teleplay by: Chuck Lorre & Bill Prady & Dave Goetsch </Td> <Td> December 14, 2009 (2009 - 12 - 14) </Td> <Td> 3X5562 </Td> <Td> 15.58 </Td> </Tr> <Tr> <Th> 52 </Th> <Td> 12 </Td> <Td> "The Psychic Vortex" </Td> <Td> Mark Cendrowski </Td> <Td> Story by: Lee Aronsohn & Steven Molaro Teleplay by: Chuck Lorre & Eric Kaplan & Jim Reynolds </Td> <Td> January 11, 2010 (2010 - 01 - 11) </Td> <Td> 3X5561 </Td> <Td> 15.82 </Td> </Tr> <Tr> <Th> 53 </Th> <Td> 13 </Td> <Td> "The Bozeman Reaction" </Td> <Td> Mark Cendrowski </Td> <Td> Story by: Bill Prady & Lee Aronsohn & Jim Reynolds Teleplay by: Chuck Lorre & Steven Molaro & Steve Holland </Td> <Td> January 18, 2010 (2010 - 01 - 18) </Td> <Td> 3X5563 </Td> <Td> 14.99 </Td> </Tr> <Tr> <Th> 54 </Th> <Td> 14 </Td> <Td> "The Einstein Approximation" </Td> <Td> Mark Cendrowski </Td> <Td> Story by: Lee Aronsohn & Dave Goetsch & Steve Holland Teleplay by: Chuck Lorre & Steven Molaro & Eric Kaplan </Td> <Td> February 1, 2010 (2010 - 02 - 01) </Td> <Td> 3X5565 </Td> <Td> 15.51 </Td> </Tr>

List of the big bang theory episodes wiki