1) The Olympic motto is "Citius, Altius, Fortius," which is Latin for "Faster, Higher, Stronger."

2) Serena Williams is an American professional tennis player widely regarded as one of the greatest athletes in the sport. She has won numerous Grand Slam titles and Olympic gold medals and has become an influential figure both on and off the tennis court.

3) The book series "The Chronicles of Narnia" by C.S. Lewis has sold over 100 million copies worldwide.

4) The Sahara Desert, located in North Africa, is the largest hot desert in the world, covering an area of about 9.2 million square kilometers (3.6 million square miles). It is characterized by vast stretches of sand dunes, rocky plateaus, and extreme temperatures.