The table lists the index of refraction for various substances at 20 °C for light with a wavelength of 589 nm in a vacuum.Through which substance will light with a vacuum wavelength of 589 nm travel with the greatest speed? 
Definitions:
Single Fathers
Men who are the sole caregivers and providers for their children without the presence or assistance of the children's mother.
Custody
The protective care or guardianship of someone or something, often used to describe the legal guardianship a court may grant to a parent or guardian.
Remarriage Rates
Statistical measures indicating the frequency at which individuals who have been married previously enter into subsequent marriages.
Cohabitation
A living arrangement where two people who are not married live together in an intimate relationship, often as a precursor to or alternative to marriage.
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