Standard & Poor's warns that California's financial recovery could be threatened by lower than projected tax revenues and a court ruling that prevents the state controller from withholding lawmakers' pay if they don't pass a balanced budget by the June 15 deadline. Thousands of people flooded the streets of Oakland and San Francisco for what organizers billed as a May Day General Strike. Issues of protest included immigration, labor rights, and the Occupy movement's message of income inequality. Incidences of violence dominated the headlines, while the Oakland police toned down their response amid criticism and a court investigation into their previous tactics. Two new studies in the Annals of Internal Medicine recommend starting mammogram screenings for women in their 40's only if they have high risk factors, such as dense breast tissue or a close relative with breast cancer before the age of 50.