Before the Globally Harmonized System of Classification and Labelling of Chemicals (GHS) was created and implemented, there were many different regulations on hazard classification in use in different countries, resulting in multiple standards, classifications and labels for the same hazard.
Pneumatics Vs Hydraulics. The pros and cons of each system. Pneumatics offer a very clean system, suitable for food manufacturing processes and other processes which require no risk of contamination. Hydraulics is generally not used in these environments due to the risk of hydraulic oil leaks from faulty valves, seals or burst hoses.
The Human vs. the Frog. There are many similarities and differences between the body of the human and the body of the frog. First, the digestive system which in both bodies works as a series of hollowed tubes to help digest food and nutrients which all lead to the anus.