Countries of the World

Beneath the city of Cincinnati, Ohio is a huge labyrinth of tunnels and stations. The subway system was proposed in the 1910s as an upgrade of the streetcar system. Construction was interrupted in the turbulent years that followed, and never resumed because of inflation and politics.

According to a University of Chicago study, of 1,500 centenarians, babies that are born between September and November are more likely to live to be 100 than babies born at other times of the year. One possible hypothesis for this is that exposure to seasonal infections seems to have a long-lasting effect on health.

For approximately 200 years, microscope technology remained relatively unchanged. In the 1850s, however, Carl Zeiss, a German engineer, developed improvements for the device! Joseph Jackson Lister also helped eliminate the unequal bending of light hitting the microscope lens, leading to further improvements!