Airplanes stay in the sky because of the principles of aerodynamics, especially lift. The wings of an airplane are shaped to make air move faster over the top and slower underneath. This difference in air pressure creates an upward force called lift, which helps the airplane rise and stay in the air. In addition to lift, airplanes rely on engine

The heart is a vital organ that pumps blood throughout the body. It works like a powerful pump, sending oxygen-rich blood from the lungs to all parts of the body and bringing back oxygen-poor blood to be recharged. This continuous circulation delivers nutrients and oxygen to cells and removes waste products like carbon dioxide. A healthy heart i

The water cycle is the continuous movement of water on, above, and below the surface of the Earth. It starts when the sun heats up water from oceans, lakes, and rivers, causing it to evaporate and turn into water vapor. This vapor rises into the sky, cools, and forms clouds through condensation. When the clouds become heavy, water falls back to the

Viruses and bacteria are tiny organisms that can cause diseases, but they are very different. Bacteria are living cells that can grow and reproduce on their own, while viruses are much smaller and need to infect a host cell to multiply. Some bacteria are helpful, like those in our gut that aid digestion, but viruses are always harmful and cause inf