In this episode of SciTech Now, a New York-Historical Society exhibit on advancements in tech; the many connections between STEM and hip hop; the importance of charting and naming exoplanets; and the complicated physics behind removing dams.

Dams can fundamentally change large swaths of river ecosystems. But age, disuse and advances in technology have made many dams obsolete. Our environmental news partner, Earthfix, takes a look at the complicated physics behind removing these iconic structures.