How Humans Living in Civilization are Like Domesticated A...

The first characteristic is living in an artificial environment. Humans established cities and converted the space we live in, to the utmost degree, into an artificial environment. We carry out our lives surrounded by houses, roads, water and sewer systems, automobiles, trains, and electricity. Waking up early, riding a train to one’s place of employment, and working in an air-conditioned office bears a certain resemblance to a chicken in a livestock factory. [7/8] The second characte...

 We Must Think Outside the Rocket Equation

The rocket equation contains three variables. Given any two of these, the third becomes cast in stone. Hope, wishing, or tantrums cannot alter this result. Although a momentum balance, these variables can be cast as energies. They are the energy expenditure against gravity (often called delta V or the change in rocket velocity), the energy available in your rocket propellant (often called exhaust velocity or specific impulse), and the propellant mass fraction (how much propellant you need com...