1) The English alphabet has five vowels: A, E, I, O, and U.

2) The Earth's core is primarily composed of iron and nickel and is as hot as the surface of the sun.

3) The first commercially available digital camera, the Dycam Model 1, was introduced in 1990 and had a resolution of 376 x 240 pixels.

4) The development and adoption of renewable energy sources, such as solar and wind power, have contributed to the transition to cleaner and more sustainable energy systems, reducing reliance on fossil fuels and mitigating climate change impacts.