It was my delight to be responsible for  much  of  the tasting  and  drinking  experiments  that  are  an  obvious part  of  the  development  of  that  delicious  liquid-  Guinness.  It  was  in  connection  with  this  that  I  began to  realize  how  impossible  it  is  to  find  human  beings    without  biases,  without  prejudices,  and  without the  delightful  idiosyncrasies  which  make  them  so  fascinating  ....  We  all  have  prejudices  about  certain numbers,  letters,  or  colours,  and  all  of  us  are  very superstitious.  We  all  behave  irrationally.