1) In Greek mythology, the Trojan War is a legendary conflict between the city of Troy and the Greeks, sparked by the abduction of Helen of Troy. It is immortalized in Homer's epic poems, the Iliad and the Odyssey, and features famous heroes like Achilles, Hector, and Odysseus.

2) The word "oxygen" contains two vowels: O and E.

3) The New England Patriots and the Pittsburgh Steelers hold the record for the most Super Bowl wins, with six championships each.

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