The horizontal fraction bar was introduced by the Arabs.
Did you know?
In 1844, Charles Goodyear obtained the first patent for a rubber condom.
Did you know?
On average, the stomach produces 2 L of hydrochloric acid per day.
Did you know?
Oxytocin is recommended only for pregnancies that have a medical reason for inducing labor (such as eclampsia) and is not recommended for elective procedures or for making the birthing process more convenient.
Did you know?
There are more nerve cells in one human brain than there are stars in the Milky Way.
Ancestral versus shared derived characters involving morphological traits.
How the immune system fights a viral infection
Sociologists study the social factors that underlie human behavior, the experiences that mold us, ...