Vaccines are developed through a careful process that begins with research to identify the part of a virus or bacteria that triggers an immune response. Scientists then create a vaccine that safely exposes the body to this part, allowing the immune system to learn how to fight the disease without ca

Sleep cycles consist of several stages, including light sleep, deep sleep, and REM (rapid eye movement) sleep. Each cycle lasts about 90 minutes and repeats multiple times during the night. REM sleep is when most dreaming occurs and plays a key role in memory and emotional health. Proper sleep cy

Space exploration began in the mid-20th century with the launch of the first artificial satellite, Sputnik, by the Soviet Union in 1957. This event sparked the space race between the United States and the Soviet Union, leading to milestones such as the first human in space and the Apollo moon landin

Plastic pollution is a major threat to ocean ecosystems worldwide. Large amounts of plastic waste, such as bags, bottles, and microplastics, end up in the oceans, harming marine animals that ingest or become entangled in the debris. This pollution disrupts food chains and damages habitats like coral