Originally published at: https://bigideas.network/conservation-of-energy/
All of the energy around you, from the light bouncing into your eyes to the heat coming out of your toaster, comes from an unbroken chain of events going back to the Big Bang.
What’s more, all the energy that will ever exist was created in that moment. This is because energy only ever moves from one place to another, it never truly disappears.
This is the law of the ‘conservation of energy’.
To demonstrate this law, let’s take a closer look at the light coming out of your screen, and where it really comes from…