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Carl Sagan was perhaps the best science spokesman to the general populace about scientific ideas and anyone else narrating a Cosmos remake would probably suffer by comparison. He died too early.
I am hopeful that subsequent episodes will go into more detail that the first episode.
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I'd love to have his speech to Congress about electrons shown around a few times.
Some guy was wasting time studying why waving a magnet past a wire caused a connected galvanometer to move.
Tiny electric charges, smaller than even these little atoms? What a useless endeavor.
And then we welcome forth the electrical age, thanks to that trivial little discovery: Moving magnetic fields can move electrical charges in a conductor.
Just part of the effort to quell the short-sighted cries of, "Why are we doing <research>? It doesn't have any applications!"
Or hell, here's another real big "oops":
Written language. Symbols on paper. How could something like that lead to better buildings, or machines that can fly?
Theory doesn't mean what you think it means.
When someone says "theory", you think it means an educated guess. In science, that's actually called a hypothesis. A scientific theory is an explanation that can be repeatedly confirmed through experimentation and observation. Theory is misused very often and causes a lot of misunderstandings.
Yes, this. You hear it a lot on TV: Someone whips out a "theory" in a few seconds.
"Hypothesis" is too big of a word, and might frighten a viewer into changing the channel.
Our GPS satellite network is calibrated using Einstein's Theory of relativity. The theory states that the faster an object moves relative to another object, the slower time will pass. Because of the extreme velocities of the GPS satellites in space, their internal clocks have compensate for time dilation. If they didn't, the directions they send would be 100's of feet off.
If it's called a theory, it means it's on pretty solid ground. If it's a hypothesis, then you can question it.
And don't forget the
special (corrected later) relativity part of it: The stronger the gravitational field is, the slower time gets.

The satellites are farther from Earth than we are, so their clocks run a little faster because of that.
The special and general effects don't perfectly balance though. If I'm remembering correctly, the high speed's effect is greater.