1) The world's oldest living plant is believed to be a clonal shrub called "Old Tjikko" in Sweden, estimated to be over 9,500 years old.

2) The smallest unit of time is known as a zeptosecond, which is equal to one trillionth of one billionth of a second.

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

4) The Berlin Conference in 1884-1885 divided Africa among European powers and set the stage for the colonization of the continent.