Evolution is the strongest fact of science and the most interesting branch of science. For example what could be more interesting than this tiny creature who lived 540 millions years ago and is also the earliest known ancestor of humans (and numerous other creatures).

"Saccorhytus was about a millimetre (0.03 inch) in size, and is thought to have lived between grains of sand on the sea bed."

"The researchers were unable to find any evidence that the animal had an anus, which suggests that it consumed food and excreted from the same orifice."

"To the naked eye, the fossils we studied look like tiny black grains, but under the microscope the level of detail was jaw-dropping."

"We think that as an early deuterostome this may represent the primitive beginnings of a very diverse range of species, including ourselves. All deuterostomes had a common ancestor, and we think that is what we are looking at here."

This was a fantastic discovery.

BBC Science & Environment: Scientists find 'oldest human ancestor'