1) The global push for COVID-19 vaccination campaigns has been a significant focus, with the development and distribution of vaccines to combat the spread of the virus and protect public health.

2) Male seahorses are the ones who give birth to their offspring.

3) The blue whale is the largest animal to have ever existed, with an average length of about 82 feet (25 meters).

4) The Great Wall of China is not visible from space without aid, contrary to popular belief.