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Bacterial resistance to antibiotics is an example of natural selection. In a population of bacteria there may be some individuals that are not affected by the antibiotic. This may be due to random changes...

Crude oil is separated into fractions in a process called fraction distillation. The crude oil mixture is separated in a distillation column. The column is hot at the bottom and cool at the top. Fractiona...

To calculate the probability assume it is equally likely to choose any of the 10 balls. This is reasonable as we are told that the balls are the same apart from their colours. If we label each ball by num...

During the Nazis' years in power between 1933 and 1945, Joseph Goebbels was given the very important task of making sure that the Nazi message was effectively spread, through the use of propaganda. One of...

Super volcanoes are much bigger than normal volcanoes, usually erupting at least 1000 cubic km of material in a single event and far less frequently than normal volcanoes. Normal volcanos erupt nearer to ...