This Day in History: 0000-01-01

1-8 Jan – French forces under the Duke of Guise conquered the fortress at Calais, the last English territory in France (1558).
1 Jan – German scientist William Roentgen announced his discovery of x-rays (1896).
1 Jan – All cigarette packages sold in the US were required to include the US Surgeon General’s warning “Caution: Cigarette smoking may be hazardous to your health (1966)
1 Jan – The first law requiring fluoridation of public water supplies became active in Connecticut (1967).
1 Jan – The Joint Commission on the Accreditation of Health Care Organizations (JCAHO) enacted a policy to remove accreditation from all hospitals allowing indoor smoking (1992).
1 Jan – Iowa became the first state to ban mercury (thimerosal) in all vaccines used in children (2006).