Did you know?
There used to be a metric calendar, as well as metric clocks. The metric calendar, or "French Republican Calendar" divided the year into 12 months, but each month was divided into three 10-day weeks. Each day had 10 decimal hours. Each hour had 100 decimal minutes. Due to lack of popularity, the metric clocks and calendars were ended in 1795, three years after they had been first marketed.
Did you know?
IgA antibodies protect body surfaces exposed to outside foreign substances. IgG antibodies are found in all body fluids. IgM antibodies are the first type of antibody made in response to an infection. IgE antibody levels are often high in people with allergies. IgD antibodies are found in tissues lining the abdomen and chest.
Did you know?
On average, the stomach produces 2 L of hydrochloric acid per day.
Did you know?
Interferon was scarce and expensive until 1980, when the interferon gene was inserted into bacteria using recombinant DNA technology, allowing for mass cultivation and purification from bacterial cultures.
Did you know?
The familiar sounds of your heart are made by the heart's valves as they open and close.
Examples of the results of sexual selection, a type of natural selection.
Acid-base balance and imbalance.
Conjugate acid-base pairs consist of a proton donor and a proton acceptor
When a Tornado Strikes: Social Organization Following a Natural Disaster
Natural defenses against stomach acid.
Acid–Base Balance