*PHYSICS*
The study of physics focuses on laws and properties that behavior of all matter. Physics often involves things we can't see or touch, but can prove, like gravity. We can't see or touch gravity, but because of years of experiments, we know it's there.
Physicists also study energy, mechanics, motion, waves, electricity, nuclear reactions, and forces. If it's a structure or involves a motor, physics was surely considered when creating it.
Albert Einstein was one of the most famous physicists to date. He developed the theory of relativity, which is the basis for black holes and the potential for time travel, as well as how matter is converted to energy, which is used in nuclear power plants.
*CHEMISTRY*
Chemistry is the study of chemical reactions and properties of matter. All the principles in chemistry are based on what we know about physics. As you can see, science topics build on each other, like a pyramid. Chemistry involves how atoms, the smallest particles of the world, bind together to create compounds. Although this might seem minor, chemistry is responsible for nearly any household product you use. Hair care products, cleaning products, even the packaged foods you eat, are all based in chemistry. For example, in the lab, scientists use chemical reactions to make compounds that smell like certain natural foods.
Other chemists had a more significant impact on the world. Marie Curie was the first to discover two new radioactive elements and to use radiation to treat cancerous tumors. Her work revolutionized medicine. Unfortunately, she eventually died of radiation exposure. Before her death, she received a Nobel Prize in Chemistry, one of the most esteemed awards for scientists.
*BIOLOGY*
Biology is the study of life, and the principles and compounds in chemistry from the foundation for it. Biology spans from studying the most minuscule structures inside cells, called organelles, to giant masses of land with specific climates, called biomes. Biologists study cells, genetics, anatomy and physiology of the body, evolution, and ecology. Biology is perhaps the most relevant to human life, as many biologists focus on studying our bodies and the components inside them, like cells and DNA.
Biology is subdivided into separate branches for convenience of study, though all the subdivisions are interrelated by basic principles. Thus, while it is custom to separate the study of plants (botany) from that of animals (zoology), and the study of the structure of organisms (morphology) from that of function (physiology), all living things share in common certain biological phenomena—for example, various means of reproduction, cell division, and the transmission of genetic material.
Biology is often approached on the basis of levels that deal with fundamental units of life. At the level of molecular biology, for example, life is regarded as a manifestation of chemical and energy transformations that occur among the many chemical constituents that compose an organism. As a result of the development of increasingly powerful and precise laboratory instruments and techniques, it is possible to understand and define with high precision and accuracy not only the ultimate physio chemical organization (ultrastructure) of the molecules in living matter but also living matter reproduces at the molecular level. Especially crucial to those advances was the rise of genomics in the late 20th and early 21st centuries.
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