At an educated guess, upwards of half a million men, women and children are without a roof over their heads in Kolkata. They are forced to sleep on pavements, in parks and gardens, or in doorways. Mos them survive on handouts, begging and occasional work. But there is no safety net to catch them. Ordinary illness is often fatal: the destitute cannot afford even simple medicines, and the city is unable to provide free preventive health care for the destitute. For many years, one man - JACK PREGER - ran a famous clinic on the pavement in Middleton Street for these people.