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

2) The first successful human heart transplant was performed by Dr. Christiaan Barnard in 1967.

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

4) Michael Jackson's album "Thriller" is the best-selling album of all time, with estimated sales of over 66 million copies worldwide.