«It just looks like a flat line, but that's a very powerful constraint on the planet's atmosphere,» Bean says. (scientificamerican.com)
In addition to these structural elements, the presence of mafia represents a powerful constraint on policy development and efficiency. (blog.politics.ox.ac.uk)
Because diffusion becomes less efficient as the tubes get longer, the atmospheric concentration of oxygen is a powerful constraint on body size, especially for active insects that fly. (sciencemag.org)