index - a numerical scale used to compare variables with one another or with some reference number. 1  margin of error, margin of safety, safety margin - the margin required in order to insure safety; in engineering the margin of safety is the strength of the material minus the anticipated stress.
Nutty Ways to Celebrate Squirrel Appreciation Day This Year. SQUIRRELS! Whether you love them or loathe them, National Squirrel Appreciation Day, January 21st, is a great time to take a few moments and learn about these nutty animals. If you count flying squirrels we have 10 tree species in North America.
In a nutshell Love and Friendship Day (Dia de amor y amistad) is just another St. Valentineâs Day and it is celebrated on September 20. Legend has it that Saint Valentine was a Roman priest who was beaten then beheaded by Roman Emperor Claudius II for defying the mandated rule of prohibiting soldiers from marrying.