100 years ago, we built apartment heaters so strong that they worked with the windows open, because we believed that fresh air would fight against the flu: How

100 years ago, we built apartment heaters so strong that they worked with the windows open, because we believed that fresh air would fight against the flu: How Spanish Flu Pandemic Changed Home Heat Radiators: https://www.npr.org/2020/12/10/945136599/how-spanish-flu-pandemic-changed-home-heat-radiators https://www.npr.org/2020/12/10/945136599/how-spanish-flu-pan...