Play the blood typing game. What happens if you get a blood transfusion with the wrong blood type? Even though a patient's own blood type is the first choice for blood transfusions, it's not always available at the blood bank. Try to save some patients' lives and learn about human blood types!
A simple question about why the USA (together with Liberia and Burma) is still measuring in miles, yards and inches, pints and cups, acres, Fahrenheit etc., lead me to this very interesting article: "The Metric System, the United States of America, and Scientific Literacy." I learned f.i. that the Metric Conversion Act from 1975 was more or less vetoed by president Reagan in 1982.
Shows pathogens attacking a healthy white blood cell. Antibodies are sent out to render the pathogen inneffective and mark it as "food" for the macrophage. (Click through to original link for better explanation!)