1) Ryan Reynolds is a Canadian actor, producer, and entrepreneur known for his roles in films such as "Deadpool," "The Proposal," and "Detective Pikachu." He has gained recognition for his comedic timing and charismatic performances on-screen.

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

3) The NBA (National Basketball Association) is widely regarded as one of the most popular and competitive professional basketball leagues in the world.

4) The Earth's core is primarily composed of iron and nickel and is as hot as the surface of the sun.