Gregor Johann Mendel is known as the father of modern genetics. He used cross-breeding to develop different kinds of peas. This allowed him to make predictions about the outcomes. These are now called Mendel's Laws of Heredity. They explain how traits are passed from generation to generation. Mendel also discovered dominant and recessive genes.
Do you know how much planning it takes to get ready for a camping trip? There is food to buy, supplies to pack, and activities to plan. It doesn't seem like much work if you divide everything equally among your friends and family. If everyone does his or her fair share, it is much easier to have fun once you arrive at your campsite. After the work is done, it is time to relax and toast marshmallowsâ€”yummy! 32pp.
Benjamin Franklin was a man of many talents. His mind was constantly working to make things better for the colonists both before and after independence. Franklin was also a great writer, and he contributed to both the Declaration of Independence and the Constitution.
Antoine Lavoisier has been called the founder of modern chemistry. The French scientist is most remembered for developing the scientific method, which is a careful, step-by-step process for proving or disproving something.
Community leaders guide people and help them in times of trouble. They are role models, such as school principals, mayors, and Red Cross volunteers and often teach and help with charities. As the needs of people change, so do the jobs of community leaders.
Government leaders help to govern our country, our states, and our cities. They make important decisions, solve problems, and see that laws are enforced. The people they serve elect most government officials. Long ago, there were not as many government officials as there are today because the United States had a smaller population.
Atoms are the building blocks of everything around us. Inside the atom is the nucleus, with protons and neutrons. But there are even smaller particles that make up protons and neutrons, called quarks. Everything that scientists know about atoms is part of the Atomic Theory, which originated in ancient Greece, but continues even today.
Thomas Edison's inventions changed the world. His most famous invention is the light bulb, but he also invented generators and the power grid. Edison holds 1,000 patentsâ€”the record for the most new inventions. He even started his own electric company.
Sanitation workers remove the trash and garbage that people and businesses produce. Increasing amounts of garbage and trash are becoming a problem in our world today.
Bank tellers help people take care of their money. Long ago, bank tellers did most of their work by hand. Today, computers make their work faster and easier. There are even machines called Automatic Teller Machines, or ATMs. Although convenient, ATMs cannot replace bank tellers.
Store clerks help people shop. Many years ago, stores were smaller and store clerks had to perform most of the jobs in the store. Today, stores are larger and usually employ several store clerks to help. Store clerks today must know how to use computers to do their jobs.
Actors have entertained audiences for thousands of years. In the past, plays were performed both to entertain and to teach. Today, plays involve the use of lighting, sound systems, and elaborate sets and often have large casts that include many actors.
Throughout history, people have recorded ideas and important events in their lives and communities. Methods of writing have changed greatly over the years. Today, computers make a writer's job much easier and enable people to write and publish more material than ever before.
Long ago, it often took weeks for postal workers to deliver mail to people who lived far away. Today, mail is transported quickly by trucks and airplanes, and it usually reaches its destination in a few days. Postal workers deliver mail directly to homes, businesses, and mailboxes.
Librarians lend and take care of books. Many years ago, the job of a librarian was simpler because librarians only took care of a few books and libraries were small. Most libraries today contain many books, magazines, computers, and other media equipment. Librarians today help people find information and show them new ways to find it.
Farmers are important because they grow the food that people eat. Modern equipment enables farmers to grow more food for an ever-increasing world population.
Fishers have provided food for thousands of years. Long ago, fishers had to fish close to land and used simple fishing tools such as knives, hoes, and spears. With the use of modern boats and fishing equipment, today's fishers fish far out in the ocean and catch a large variety of fish for market.
For over two hundred years, individuals have protected and served their communities as lawmen. Today, people who help enforce the law are called police officers because both men and women can serve in the police force.
Many years ago, doctors trained nurses to help them treat people. Today, nurses go to school to learn about medicine and about how to help people when they are sick. Nurses perform many of the same duties as doctors.
The first teachers in the United States were students who did well in school and were hired to teach other students. Today, teachers must have college degrees to teach. Schools today are larger than those in the past and often have several separate classes at the same grade level.
Firefighters are community heroes and their job is to help wherever there is trouble. Firefighters must be well trained, wear protective uniforms, and ride on trucks that are equipped to fight fires. Firefighters and the equipment they use today have changed significantly over the years.
A comprehensive look at the history, people, technology, and future of space exploration. This book is at the reading level of 3.6 with a word count of 1133.
This book explores the different parts, uses, and incredible potential of the brain. Reads at the level of 2.7 with a word count of 668.
Provides information on the planets that make up our solar system and their relationship with Earth. This book is at a reading level of 2.6 with a word count of 607.
A fun and interesting overview of the living conditions for astronauts in space. This book is at a reading level of 3.6 with a word count of 1121.