circa 13,700,000,000 BCE — The Big Bang

The short version: in the beginning, there was nothing, which then exploded.

The longer version: all the matter in the universe was compressed into the smallest possible volume. Try to understand that this is so much matter that the force of gravity warps the laws of physics as we know them. The whole thing is is under so much pressure that it explodes – forming the universe as we know it as the laws of physics change radically from picosecond to picosecond, and eventually energy cools and congeals into matter.

It’s like they say: “it all started with the Big Bang!

CMB Timeline300 no WMAP.jpg
By NASA/WMAP Science Team – Original version: NASA; modified by Ryan Kaldari, Public Domain, Link

As mentioned in:

The Big Bang Theory — Barenaked Ladies

circa 4,540,000,000 BCE — The Earth gets cooler

In the early millenia of what is sometimes referred to as the Hadean era of the Earth, there were no rocks as we would commonly understand the term – it was too hot for them to form. Still, the Earth was slowly cooling and solidifying. It’s worth noting that the Sun itself was not as hot at this time – like the larger planets of our solar system, it was still accreting matter to itself. Rockballs like the Earth (and Mars and Venus) were largely done with this process (although the occasional meteor or cometary impacts still occurred).

By the end of this era, approximately 3,800,000,000 years ago, the Earth had cooled sufficiently to allow for the stable formation of rocks, and its surface had begun to split into tectonic plates. Most importantly for humanity’s future, life had begun: the earliest evidence of photosynthesis dates from around this time.

circa 4,200,000,000 BCE — The Earth’s oceans form

The majestic oceans of planet Earth were formed neither quickly nor simply. It took literally millions of years between the first surface water’s appearance and the creation of the primordial sea.

Several factors contributed to this: the gradual cooling of the Earth was the first and most important, but also important was the slow release of water from existing minerals, the condensation of steam, and even the addition of water in the form of ice from occasional cometary collisions with the planet.

The first waters soon became the habitat of early prokaryotes – whose biochemical processes led to the formation of still more water. Indeed, it is possible that the majority of water on the planet today exists as a result of these organisms.

circa 284,000,000 BCE — Bolosaurid Eudibamus is the first known biped

The earliest known bipedal vertebrate, eudibamus cursoris was a small parareptile. The sole specimen that has been found (in Thuringia, Germany) measured about 25 cm long – about the size of a house cat. Reconstructions of it give it an appearance resembling a cross between a tiny velociraptor and a modern iguana.

The sole specimen of it known to science was discovered in 2000 by a paleontological team including David S. Berman, Robert R. Reisz, Diane Scott, Amy C. Henrici, Stuart S. Sumida and Thomas Martens. The species is believed to have existed for a span of about five million years or so.

circa 250,000,000 BCE — The super-continent Pangaea forms

Pangaea was a super-continent – an agglomeration of multiple continents – that came into being about 250 million years ago. It was composed of all the continents we know today fused into a single landmass, surrounded by a single ocean (called Panthalassa) – and was the last time such a thing occurred. In fact, it was slightly larger than the combined areas of the modern continents, as supercontinent formation tends to lead to lower sea levels.

Pangaea (the name comes from the Greek Pan meaning All and Gaea meaning Earth) existed during the Paleozoic and Mesozoic eras, and its best known inhabitants were the dinosaurs. It began to break up approximately 75 million years after it formed, although the continents would not reach anything approximating their modern positions until only about 35 million years ago, when the Indian subcontinent collided with Asia.

circa 65,500,000 BCE — The Cretaceous–Tertiary extinction event wipes out the dinosaurs

Everyone loves the dinosaurs. A lot of people – if the Jurassic Park films are to be believed – would like to see them come back. But without their extinction, we wouldn’t be here today.

Even now, it’s still not clear what exactly caused the extinction event – but the best known hypothesis is that of Luis and Walter Alvarez, which states that a meteoric or cometary impact caused a nuclear winter-like effect that altered the climate drastically, wiping out something like 75% of all species alive at the time. The effects were particularly felt by larger species – which included most dinosaurs.

In the wake of the event, now open evolutionary niches were occupied by mammals and birds, including our own ancestors.

circa 3,900,000 BCE — Australopithecus evolves

Australopithecus was an early proto-hominid that evolved in Eastern Africa around 4 million years ago. It consisted of a number of sub-species: A. anamensis, A. afarensis, A. sediba, and A. africanus; and two more sub-species whose genus is disputed: A. robustus and A. boisei. Over the course of two million years or so, the various Australopithecenes ranged across Eastern and Southern Africa.

The Australopithecines evolved about 2 million years after the split between the ancestral roots of humanity and chimpanzees (our closest relative), and one or more of the various sub-species of Australopithecus is likely to have been the progenitor of the Homo Genus, to which modern humanity (homo sapiens sapiens) belongs.

circa 300,000 BCE — Mousterian tool kit evolves among Neanderthals

The earliest known example of tool making by a hominid species, the Mousterian tools were created by members of the species homo neanderthalensis. They were primarily a flint-based technology, consisting mostly of cutting and scraping tools. Their name derives from Le Moustier in France, where such tools were discovered. However, it is unlikely that Le Moustier is the actual site of the tools’ origin, as similar tools have been found throughout Europe, the Near East and North Africa. Wherever they were invented, they clearly disseminated widely and – one assumes – swiftly.

The advent of tool making is the beginning of humanity’s technology-enabled conquest of the world. Up until this point, our ancestors were one species among many – a little smarter than most, but not especially better adapted than any other. Tool making changed that, making hominid species deadlier and more efficient hunters, and leading in time to the technological civilization that anyone reading this lives in today.

April 11, 1890 — Joseph Merrick, the Elephant Man, dies

Joseph Merrick (often incorrectly called John) was one of the most notoriously deformed human beings ever to live. Among other unusual features, he had thick, lumpy skin with enlarged lips, and a bony lump growing from his forehead. One of his arms and both of his feet became enlarged, and at some point during his childhood he fell and damaged his hip, resulting in Merrick becoming perpetually lame.

He made a living (of sorts) as a circus freak for many years (about the only work he could get – Merrick had no illusions about how others regarded his appearance, although those able to look beyond that generally reported him to be friendly and well-mannered, if understandably shy), until a Dr Frederick Treves arranged for him to reside in a hospital in London. It was here that Merrick spent the last six years of his life, being examined by the finest medical minds that the Victorian Era had to offer, and remaining (even to this day) enigmatically undiagnosable. Merrick was only 27 when he died, apparently from injuries caused in his sleep by his enlarged head bones. Most of what is known about him today comes from the writings of Treves, which were unfortunately rather subjective.

Joseph Merrick carte de visite photo, c. 1889.jpg
By Unknown
I (User:Belovedfreak) have emailed the Royal London Hospital Archives to request information regarding the author. The Trust Archivist for Barts and The London NHS Trust has confirmed that they do not know the name of the photographer, and no such name is included on the carte de visite. – Photograph downloaded from Sideshow Wiki (direct image link)
The image hosted at the Sideshow Wiki is a copy of an original carte de visite of Joseph Merrick that is owned by Royal London Hospital Archives.
Royal London Hospital ref: RLHLH/P/3/24/2.
The carte de visite in the Royal London Hospital Archives had been in the possession of the Rev. H. Tristram Valentine, who was Chaplain at the London Hospital from 1885–1889., Public Domain, Link

As mentioned in:

If I Had A Million Dollars — Bare Naked Ladies