What unit would I used to measure two towns?

How many hours is Toronto behind London? When light travels from air into glass the wave speed? What is the basic difference between isotopes of the same element other than atomic mass? What is the chemical equation for bioluminescence? Is polydactyly a mutation? What are business scientist called? What must a scientist do to determine whether a cell contains mitochondria? What does liquid plus heat equal? Disease is easier to spread in society? Which planet is 0.72 astronimical units from the sun? How would a molecule that mimics cyclic AMP affect an olfactory receptor? What are the chemicals present in soap noodles? If each orbital had three electrons instead of two then how many valence electrons would oxygen sulfur and selenium have? Which microscope would you use to examine living cells lining the respiratory tract to determine how the cells use tiny hairs to move dirt away from lungs? What is the chemical symbol for thoron? What is a near fall in wrestling? A coherent succession of single pitches is? If you experience micro sleep? How much does 1 ream of paper weigh? Very few minerals are compounds?