High up in a tall tree, a fluffy gray ball sits wedged in a fork of the branches. Slowly the ball begins to uncurl and soon you can see a sleepy-looking face and four furry legs. It's a koala waking up and it's already reaching for a branch of eucalyptus leaves to munch.
Albert Einstein was one of the most brilliant scientists who ever lived. The theories that he formulated about time, light and gravity have changed how we look at the world, and resulted in many new inventions. But did you know that he was so absent-minded that he once forgot where he lived? Or that, even though he was an advocate of world peace, his work led to the creation of the atom bomb? …