1) The first consumer digital video recorder (DVR), the TiVo, was introduced in 1999 and allowed users to record and store television programs for later viewing.

2) The world's largest desert is the Antarctic Desert, covering around 5.5 million square miles.

3) The fingerprints of koalas are so similar to humans that they have been mistaken at crime scenes.

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