1) The strongest natural material known to man is spider silk. It is stronger than steel and more flexible than nylon.

2) 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.

3) Leonardo DiCaprio is an acclaimed American actor and environmental activist. He has starred in numerous successful films, including "Titanic," "The Revenant," and "The Wolf of Wall Street," and has been recognized with several awards, including an Academy Award.

4) A newborn kangaroo is about 1 inch (2.5 centimeters) long and weighs less than a gram.