Those that are far from the frontier can focus on improving each element. You can improve by reorganizing your work to get more done.

But once you are on the productive frontier, things are different. Improvement comes from making hard choices about trade-offs.

On May 30, 2020 the private company SpaceX launched astronauts to the International Space Station. This is said to be not only a huge step for the humanity, but also a sign that USA has become able to transport its astronauts to space without Russians' help.

• If gravity were not there, things would not attach to the Earth and fly off and away into space.
• People would be safer inside buildings because most structures are firmly grounded and would stay put even without gravity, at first.
• Anythin...