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

2) The Earth's core is hotter than the surface of the Sun.

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

4) The first successful consumer digital camera, the Apple QuickTake 100, was released in 1994 and had a resolution of 640 x 480 pixels.