Flutter is an innovative open-source UI toolkit created by Google for building natively compiled applications for mobile, web, and desktop from a single codebase. Launched in 2018, Flutter has rapidly gained popularity among developers due to its speed, flexibility, and expressive user interface capabilities. With Flutter, developers can write code once and deploy it across multiple platforms, saving time and resources while delivering high-quality, visually appealing applications. Powered by a rich set of customizable widgets, Flutter enables developers to create beautiful, responsive user interfaces that can adapt seamlessly to different screen sizes and orientations. Additionally, Flutter's hot reload feature allows developers to see changes instantly, speeding up the development process and enhancing productivity. As an open-source project with a growing community of contributors, Flutter continues to evolve, offering developers new opportunities to innovate and create cutting-edge applications for a diverse range of platforms and devices.

Yellow fever is a viral disease transmitted by mosquitoes, primarily in tropical regions of Africa and South America. Vaccination is the most effective way to prevent it. Symptoms can range from mild to severe, including fever, headache, jaundice, muscle pain, and even organ failure in severe cases.

Ebola is a highly contagious and often deadly virus that causes severe illness in humans and other primates. It's transmitted through direct contact with bodily fluids of infected individuals or contaminated objects. Outbreaks have occurred primarily in Central and West Africa, with symptoms including fever, severe headache, muscle pain, weakness, diarrhea, vomiting, abdominal pain, and unexplained bleeding or bruising. Early detection and isolation are crucial for containing its spread.

It seems nearly impossible, or at least improbable, that a driver would decidedly pass a school bus with its arm extended for children to cross. This practice, largely a result of distracted driving, texting while driving, or even watching YouTube while driving, is not only illegal but poses a significant risk to the safety of children.

Polio, short for poliomyelitis, is a viral infectious disease that mainly affects young children. It can lead to paralysis, primarily of the legs. Thanks to widespread vaccination efforts, polio has been eradicated in many parts of the world, although it remains endemic in some countries.