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There are many theories - for instance people may have caught young animals while out hunting , brought them home alive and found that some kinds were easy to keep . The report represents a compilation of any information that supports the notion that university costs , and therefore tuition , are out of control . There is also the added problem that very few such books exist , and they are all out of print , as far as I know ! This is because their stomachs and intestines are not simple tubles like our own , but have blind-ending sections where the ground-up plant food is held so that micro-organisms can get to work on it . The low temperature group will take the gum out of their mouths and roll it into a cylinder of a given diameter ( use small ruler ) , then they 'll drop the cylinder into ice water for 30 seconds . They are almost ( but not quite ) stuffed with hydrogen . When you blow air out faster , several things could be happening and we would need to do some experiments to find out which was important in causing the cooling sensation . As the Internet becomes the principal means of communication , there is an opportunity to provide faster and more timely communication and also save money .