1) The oldest known musical instrument is a flute made from a bird bone, estimated to be around 43,000 years old.

2) Emma Stone is an American actress known for her roles in films such as "La La Land," "Easy A," and "The Help." She has received critical acclaim and several awards, including an Academy Award, for her performances, establishing herself as a talented and versatile actress.

3) The Great Barrier Reef in Australia is the largest living structure on Earth and can be seen from space.

4) Mount Kilimanjaro in Tanzania is the highest mountain in Africa and attracts climbers from around the world.