The system of mass reproduction in manufacturing developed during the Gilded age. Hope this helped you.
Machines can cause physical injury, especially to younger and unexpierenced workers.
Deep in the Earth, oil and natural gas are formed from organic matter from dead plants and animals. These hydrocarbons take millions of years to form under very specific pressure and temperature conditions.
The first and probably most important thing you can do when creating/signing a contract is going over it with your lawyer - the attorney probably knows a lot more about these kinds of things than you do. Next, you need to read the contract thoroughly - don't skip anything, because it is your life/money we are talking about here. So, read and understand the contract before deciding whether or not to sign it. Once you sign the contract, you are bound by it - there is no going back, so think carefully before signing it.