http://www.flinnsci.com/documents/miscpdfs/safety_contract.pdf
https://www.flinnsci.com/media/1041084/how_to_read_an_sds.pdf
http://www.compliancesigns.com/media/nfpa-fire-protection/1000/NFPA-704-NFPA-Diamonds-Sign-NFPA-Chart_2_1000.gif
Determining the # of Sig Figs
Adding and Subtracting with Sig Figs
Multiplying and Dividing Sig Figs