What is length? What is time? Who decided the length of a second? The crew explores the fundamentals of physics and learns how we have come to define our units of measurement.

Topics Discussed:

What is physics?

Physical quantities

Galileo: The father of modern science

How do we communicate measurements?

History of the meter

What is time? What is a second

Mass vs. weight

How we define a kilogram

Composite units

Radioactive dating

How do we measure extreme lengths, masses, and times?