1) The Eiffel Tower can be 15 cm taller during the summer due to thermal expansion.

2) The Southern Ocean surrounds Antarctica and is the coldest and least-visited ocean.

3) Chocolate is derived from the beans of the cacao tree and has been enjoyed as a delicacy for centuries. It was first cultivated by the ancient Mayans and Aztecs, who considered it a sacred drink. Today, chocolate is consumed in various forms, including bars, truffles, and beverages, and is known for its rich flavor and potential health benefits, such as improving mood and antioxidant properties.

4) The fingerprints of koalas are so similar to humans that they have been mistaken at crime scenes.