Here is a popular explanation circulating in the email circuit!!
An Israeli doctor says 'Medicine in my country is so advanced that we can take a kidney out of one man, put it in another, and have him looking for work in six weeks.'
A German doctor says 'That is nothing; we can take a lung out of one person, put it in another, and have him looking for work in four weeks.
The Russian doctor says 'In my country, medicine is so advanced that we can take half a heart out of one person, put it in another, and have them both looking for work in two weeks.'
An American Texas doctor, not to be outdone, says 'You guys are way behind, we recently took a man with no brains out of Texas, put him in the White House for eight years, and now half the country is looking for work.'