JUNE 14 IS BANNER DAY IN NORTH AMERICA
EVERY YEAR THE UNITED STATES PRESIDENT PROCLAIM THE FLAG DAY AND DECREES RISING FLAGS IN THE FEDERAL BUILDINGS, HOMES, GARDENS, WORKPLACES, SCHOOLS. ALSO IN MANY CITIES THERE PUBLIC ACTS COMMEMORATIVE.
EVIDENCIAS FISICAS DE PROCESOS QUIMICOS Y BIOQUIMICOS. EVIDENCIAS PEDAGOGICAS.