Episode #4.7
- Episode aired Apr 25, 2011
![Bang Goes the Theory (2009)](https://m.media-amazon.com/images/M/MV5BMTQ0MTM5NDQ0M15BMl5BanBnXkFtZTgwMDg2MDgwMzE@._V1_QL75_UY281_CR72,0,190,281_.jpg)
Jem builds a musical road; Dr. Yan looks at people's ability to pick healthy mates by evaluating movement alone; Liz traces her lineage with the help of DNA.Jem builds a musical road; Dr. Yan looks at people's ability to pick healthy mates by evaluating movement alone; Liz traces her lineage with the help of DNA.Jem builds a musical road; Dr. Yan looks at people's ability to pick healthy mates by evaluating movement alone; Liz traces her lineage with the help of DNA.