1) The word "book" contains two vowels: O and O.

2) The Civil Rights Act of 1964 in the United States outlawed discrimination based on race, color, religion, sex, or national origin.

3) The invention of the printing press by Johannes Gutenberg in the 15th century revolutionized the spread of knowledge and played a key role in the Renaissance.

4) The corpse flower, or titan arum, is known for its unpleasant smell, often compared to that of rotting flesh.