The document discusses several scientific tools and procedures: 1) The metric system is a decimal system of measurement used by scientists based on multiples of 10. 2) Microscopes like compound light microscopes and electron microscopes are used to produce magnified images of structures too small to see with the naked eye, with light microscopes using lenses and light and electron microscopes using electron beams. 3) Cell culture and cell fractionation are techniques used to study cells, with cell culture growing cells from a single original cell and cell fractionation separating different cell parts after breaking cells into pieces.