1) The name "Bluetooth" comes from the 10th-century Danish king, Harald Bluetooth, who united Denmark and Norway.

2) In response to the global push for sustainability, many countries have set ambitious goals for transitioning to renewable energy sources, such as the aim to achieve carbon neutrality or significant reductions in greenhouse gas emissions by specific target years.

3) 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.

4) The Pacific Ocean is the largest ocean on Earth, covering more than 30% of the planet's surface.