How many kinds of natural pearls?

How many muscles does it take to smile 17,31,57?

How many standard time zones are there in the world ?

how many faces does a rectangular prism have? And how many vertices

What planet does the natural satellites go to? What was the time was it discourerd? How long ago was it?

How many days does it take for saturn to revolve around the sun?

Considering the site has had many years to rust and decay, do you think it's likely that they'll even find anything of value,...

What is the name given to many of the elemnts that have more that one oxidation number?? is it isotopes?

How many light years away is the center of the milkyway? And how long does it take for the light of it to reach the earth? I ...

So in level 1: 2 electrons level 2: 8 level 3: 18 level 4: 32 ? an element with an atomic number of 59 how many ...

How many atoms is an average person made up of. I know that the Universe contains about 10^80 atoms. Does anyone know how m...