1) The word "triangle" contains four vowels: I, A, E, and E.

2) The phenomenon known as "black holes" occurs when matter is crushed into an infinitely small space, creating a gravitational pull so strong that nothing can escape.

3) Marilyn Monroe, born Norma Jeane Mortenson, was an iconic American actress, model, and singer, known for her beauty, charisma, and tragic personal life.

4) The Bank of England, established in 1694, is the central bank of the United Kingdom and one of the oldest central banks in the world.