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

2) Michael Jackson's album "Thriller" is the best-selling album of all time, with estimated sales of over 66 million copies worldwide.

3) The sitcom "Friends" is known for its iconic Central Perk coffee shop, where the main characters often gather.

4) The Atlantic Ocean is the second-largest ocean and is known for its strong ocean currents, including the Gulf Stream.