1) The Mariana Trench in the western Pacific Ocean is the deepest part of the world's oceans, reaching a depth of approximately 36,070 feet (10,994 meters).

2) In Egyptian mythology, the Book of the Dead is a collection of spells, prayers, and rituals intended to guide the deceased through the afterlife. It contains instructions on navigating the perilous journey, avoiding obstacles, and ultimately achieving eternal life in the presence of the gods.

3) Leonardo DiCaprio is an acclaimed American actor and environmental activist. He has starred in numerous successful films, including "Titanic," "The Revenant," and "The Wolf of Wall Street," and has been recognized with several awards, including an Academy Award.

4) The Russian Revolution in 1917 resulted in the overthrow of the monarchy and the establishment of a communist government under Vladimir Lenin.