A microscope is a scientific instrument "that produces enlarged images of small objects." The word "microscope" comes from ancient Greek words meaning "small" and "to see." Microscopes are used to investigate small objects that are too little to be seen with the naked eye... Read more
A scientist is a person "who conducts scientific research to advance knowledge in an area of interest."... Read more
The first modern computer was built in 1937. Early computers, however, had little in common with the devices we know today. For example, one computer built in 1946 "weighed 30 tons, and had 18,000 vacuum tubes" which were used for processing. When it was first turned on, it used so much electricity that it dimmed the lights in parts of Philadelphia. Yet, it could only perform one task... Read more
Your heart is a hard working muscle. If it takes you one minute to read this paragraph, your heart will have accomplished around 72 beats. Today, it will beat... Read more
Would you like to explore the solar system? Get started with this easy, step-by-step drawing guide, as you learn how to draw an astronaut. Astronauts are ordinary people... Read more
A robot is an "automatically operated machine that replaces human effort." For decades, real-life robots have worked in factories, hospitals, and elsewhere. They have also captured our imaginations... Read more