General Relativity Lecture

 This lecture was inspiring:

- Mr. Mezzacappa showed real enthusiasm for his work, the way a real scientist should.

- complicated concept explained in simple terms

- thought experiments very interesting, new way to think

- clarified concepts mentioned in A Brief History of Time

- question asked: Is the speed of light assumed or experimently determined to be constant? Experimentally determined, has to do with gravitational waves?

- groundbreaking new tech: LIGO, gravitational waves