ABSTRACT
No man has ever seen a quark. How, then, do we know they exist? The circumstantial evidence is overwhelming. We have seen the incredibly tiny bubble tracks. We have heard the eerie cries in the night. (Not even a charging neutrino makes a sound like that.) And there are the ancient legends: the tales of human sacrifices to assuage the terrible anger of the quark gods; the chants of the shamans, who believed that quarks made the sun rise and fall, the seasons change, the rivers flow home to the sea; and that they were available in three colours and four flavours. We do not believe that, of course, and yet we know there is something out there ....
