1) A newborn kangaroo is about 1 inch (2.5 centimeters) long and weighs less than a gram.

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

3) The Renaissance period, which began in Italy in the 14th century, marked a renewed interest in art, literature, science, and philosophy.

4) Mountains are formed through various geological processes, including tectonic plate movements, volcanic activity, and erosion.