The Gravitational Constant

If you change the charge on electron by a fraction of a percent then Chemistry will change a bit, but you'd still be able to have life. Without one of these two things happening either everything collapsing into black holes or no stars forming at all This is the fine tuning of G now repeat that for absolutely every single constant including speed of light The rate at which the universe is expanding and there are many many Constance's like Luke Barnes who I would regard as just about the world's leading expert on this issue.