Adam Savage is more than “from Mythbusters”. He’s an intelligent man and a champion for science. He’s also a very good speaker.
This TED video (technically TED Ed and enhanced with animations) has Adam walk the audience through how ideas can lead to scientific discoveries. Example include how Eratosthenes calculated the circumference of the Earth around 2000 BC and how Hippolyte Fizeau was able to measure the speed of light in 1849 using just basic equipment.