Use an almanac
or an encyclopedia to discover how the months
were named and why they have different
numbers of days.
If you had been born
on February 29, how
many birthdays would you have had by
Thirteen may be a lucky number
for the USA. Think of at least one reason why.
Study a dollar bill
to see if you can find "13" objects in common.
Use an almanac or an encyclopedia
to research why the number 13 is considered by some
to be unlucky.