1) 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.

2) The Brexit process, initiated by the United Kingdom's referendum in 2016, led to the country's withdrawal from the European Union in 2020, marking a significant political and economic change for both the UK and the EU.

3) The first computer mouse was invented by Douglas Engelbart in 1964 and consisted of a wooden shell and two metal wheels.

4) The construction of the Great Wall of China began in the 7th century BC and was completed over several centuries, spanning thousands of miles.