What is the oxidation state of hydrogen in NaH? What is a observation in which prior knowledge must be used? Are rubber ducks counted as chew toys? Compare the advanteages and disadvantages of crewed space exploration and space probes? The process in which water circulates from the oceans to the clouds to the land to the rivers and then accumulates back into the oceans? How much does a roll of quarters weight? What does the slope of a line on a velocity time graph tells us? What is the difference between speed and accelaration? What is the answer to a divisoin problem? Is a pistachio a dicot or a monocot? Where in your body is humerus found? How many 'winks' are said to be in a short map? Does whole numbers between -2 and 0 are finite or infinite? What is the process that releases energy to convert substances to simpler products? What does the word virual means? What is the compound name for ZnCr2O7? What is 3 over 7 as a percentage? Which is the smallest fraction of a number? How much is 0.1 in mathematics? What is 21 converted into a fraction?

How many ran in the 2012 Boston Marathon?