The responding variable is also called the dependent variable. In this experiment, the color of the potato slice at the end of its soaking time is the responding variable. For a simple experiment, such as this, it is best to have one manipulated variable, one responding variable, and everything else contant.he manipulated variable is also called the independent variable. This is what you change. For this experiment, time is the manipulated variable. You would keep each slice of potato in its cup of juice for increasing amounts of time.
Timbuktu, which is on the U.N.-designated World Heritage List, was a seat of Islamic learning for centuries, and its Ahmed Baba library, which was constructed in 2010, was home to 20,000 manuscripts dating back as early as the year 1204. It's still not known how many of the documents were destroyed. Ben Curtis/AP.
libpng is the official PNG reference library. It supports almost all PNG features, is extensible, and has been extensively tested for over 20 years.