1) The Earth's core is hotter than the surface of the Sun.

2) Sushi is a traditional Japanese dish made of vinegared rice combined with various ingredients, such as raw or cooked seafood, vegetables, and nori (seaweed). It is known for its artful presentation and delicate flavors, and has gained immense popularity worldwide. Sushi can take many forms, including nigiri (hand-pressed rice topped with ingredients) and maki (rolled sushi wrapped in seaweed), and is often enjoyed with soy sauce, wasabi, and pickled ginger.

3) The tongue of a blue whale is so big that about 50 people could stand on it.

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