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in Science August 1, 2020

How Did Life on Earth Emerge? [Infographic]

In 1952, Stanley Miller was working with Harold C. Urey designed an experiment to see how complex organic molecules might have formed under the conditions of early Earth. They believed the early Earth atmosphere would have been composed of methane, ammonia, hydrogen and water vapor. They sealed these gases in an airtight container, and then exposed the gases to sparks of electricity to simulate lightning. They continued the lightning for a week, and by the end, a reddish-brown substance had coated the walls of the container. This substance contained 11 of the 20 amino acids used by life on earth. Since Miller and Urey performed this experiment, its results have been confirmed many times by other scientists. Many scientists now believe that the early Earth’s atmosphere was composed of carbon dioxide, nitrogen and water vapor.

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in Science January 1, 2020

Variables in Science

Ok. You will be asked to draw a graph in IGCSE chemistry, physics, biology or science exams. In particular, you will be asked to draw a graph when you change one variable and measure what happens to the other variable. But let’s back up a bit. I’ve gone and used a fancy science word – variables. We need to sort out this concept before we rush into drawing graphs.

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