The installation area must be capacious and clean, lay paper or pearl brocade on the ground to prevent it from contacting the ground directly during installation.

He and his colleague Anthony Ladd, a chemical engineer at the University of Florida in Gainesville, lay out their new equations in a paper to appear in Earth and Planetary Science Letters.

And before he had time to answer, she wrote on a sheet of white paper, which lay in the middle of the table: "the bobbies are here."