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

2) Jennifer Lawrence is an American actress known for her roles in films such as "The Hunger Games" series, "Silver Linings Playbook," and "Joy." She has won an Academy Award and several Golden Globe Awards, establishing herself as one of the leading actresses of her generation.

3) Cows have best friends and can become stressed if they are separated.

4) The musical "The Phantom of the Opera" has been running in London's West End since 1986, making it the longest-running musical in history.