A thesaurus is a book that's useful for finding synonyms.
A Mercator map because it is most useful in finding direction. ;)
They are useful in finding the least common denominators.
Most caves are small but some are very large and complex. There is no standard size and finding an "average" is not very useful.
finding radiation by matter
i need a answer!!
pretty much ANYTHING
i dont have friends
The value of Pi