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anatomy of a spanish conquistador

How a small army of Spaniards brought an entire civilisation to its knees. ... read more

nuclear energy

The protons and neutrons of an atom release nuclear energy when they break apart. Every atom contains a lot of energy. The forces that hold the atom together are the strongest forces that scientists know of. ... read more

how does a calculator work

Calculators translate numbers into binary code to come up with an answer. ... read more

ussr

Former nation extending from eastern Europe E across Siberia to the Pacific Ocean. In the N it bordered on the Arctic Ocean and in the S on China, and on southwestern Asian countries. The USSR, successor to the Russian Empire, was the world’s largest nation in area and was third in population. It co... read more

people who study the earth

Throughout history, people have always wanted to understand the planet we live on. They wanted to know why the weather changes from hot to cold and back again. They wanted to know why it rains or snows and what lightning and thunder are. They wanted to know why volcanos erupt and why earthquakes move ... read more