Its now one month since my earlier post on the coronavirus pandemic A lot has changed since then. We have gone from 24,392 deaths globally on March 26 to 206,915 on April 26th. And recent analysis of total registered deaths by week in February and March, compared to the same periods in the previous year, suggest that the reported deaths (mostly hospital deaths) are only about 70% of the actual deaths. The proportion of deaths reported in developing countries without good death registration (including most of Africa, and much of Asia) will be even lower.
This is the second part of a post summarizing current understanding of the evolution of humans. In the previous post, I outlined the evolution of pre-human species from the first monkeys around 35 million years ago (Mya) to the appearance of the first human species around 2 Mya. This post takes a look across the evolution of humans from the appearance of the first human species Homo habilis to the appearance of anatomically modern Homo sapiens sapiens around 250 thousand years ago. The following figure summarizes the evolution of humans over the last 2 million years, based on  with some modifications to take account of some recent discoveries.
My son has been reading the existentialists, starting with Camus (of course, The Plague is quite relevant for more than one reason now). He recently moved on to Kierkegaard, who took a form of Christianity as a solution to existential angst. I was reminded of a book I read probably 15 years ago, by Stephen Batchelor: Buddhism Without Beliefs (London: Bloomsbury 1997) which argued that the Buddha was concerned with addressing the existential issue of suffering not with metaphysics and beliefs. I couldn’t find my copy of this, and bought another, which I enjoyed reading even more than the first time.
Today Switzerland became the country with the highest rate of confirmed cases of corona virus per million population. Well, that is if you ignore some micro-populations such as the Vatican City, San Marino, Andorra and Faeroe Islands. Why? It is landlocked with Italy, France and Germany around it. It did not close the border between Ticino and Italy for cross-border workers and many live in Italy were the virus spread rapidly. Also, it was the height of the ski season and alpine resorts were crowded with skiers from all over Europe, Britain and beyond. Here is a graph I did yesterday comparing confirmed cases per million population for the thirty leading countries (excluding small countries with population less than one million. Data are from worldometers.com at 13.11 GMT on March 24. A this point Switzerland had not yet overtaken Italy.
Our understanding of the evolution of us modern humans has changed dramatically in the last few years as ancient genomes are decoded and we discover that humans, Neanderthals and Denisovans interbred, and also in the remote past interbred with previously unknown “superarchaic” human groups. Scientists are also discovering new species of extinct hominids, and no doubt will continue to shed further light on our origins. Just to try to sort out the big picture in my own mind and to put these various discoveries in context, I’ve tried to summarize what we think we know, or at least what the evidence available to date suggests. This will no doubt continue to change.
This is the first of two posts and summarizes the evolution of pre-human species from the first monkeys around 35 million years ago (Mya) to the appearance of the first human species around 2 Mya. A following post will summarize the evolution of humans from the appearance of the first human species Homo habilis 2 Mya to the appearance of anatomically modern Homo sapiens sapiens around 250 thousand years ago and mitochondrial Eve, who lived around 178,000 years ago.
The coronavirus epidemic has now spread to most parts of the world, and Switzerland is in the top 12 countries for confirmed cases, which may not reflect the reality of cases in countries with little or no testing. This time of social distancing and self-quarantine brought to mind my great-grandfather who lived through an epidemic of bubonic plague in Sydney in 1900, the first and largest plague outbreak in Australia. In this post, I take a look at this outbreak and his experience of it through the window of the detailed journal that he kept at the time.
Last week, Freedom House released its 2020 annual report on global freedom. The report documents trends in every region of the world of declining political and civil freedom: “In every region of the world, democracy is under attack by populist leaders and groups that reject pluralism and demand unchecked power to advance the particular interests of their supporters, usually at the expense of minorities and other perceived foes.”
The report compiles a freedom index for countries based on an average of two indices for political rights and civil liberties, composed of numerical ratings and descriptive texts for each country. The 2020 index adds to a time series for countries that extends back to 1972. I’m interested to see to what extent the time series upholds the view of Stephen Pinker that there has been sustained long-term improvement in both political rights and human rights globally and this will continue (Enlightenment Now, Chapters 13 and 14).
The graph below shows time trends for the number of countries falling into three broad categories of the freedom index, labelled as Free (green shades), Partly free (orange shades) and Not free (purple shades). The graph includes 185 countries. 11 very small countries with populations less than 90,000 in 2015 are not included.
In an early post on this blog, I summarized my maternal-line ancestors and where and when they lived. In the last 6 years, there have been substantial revisions to estimates of the dates associated with these mitochondrial DNA (mtDNA) haplogroup founders, and revisions to the mtDNA haplogroup tree (deep-maternal-ancestry-and-mtdna) and this post provides an update. I am a member of mtDNA haplogroup U5, which is one of nine native European haplogroups stemming from haplogroup U which most likely arose in the Near East, and spread into Europe in a very early expansion. The presence of haplogroup U5 in Europe pre-dates the last ice age and the expansion of agriculture in Europe. Today, about 11% of modern Europeans are the direct maternal descendants of the founder U5 woman. They are particularly well represented in western Britain and Scandinavia. My more recent maternal ancestors were part of the population that tracked the retreat of ice sheets from Europe at the end of the last ice age and re-colonized Britain about 12,000 years ago.
The mtDNA sequence at the root of each haplogroup arose from one or more mutations in the mtDNA of just one woman, and the age of the associated haplogroup gives the time in the past when this specific woman lived. To emphasise that the maternal clan founders were real individuals, I have used the names given to them by Sykes  and Oppenheimer  and given my own names to the more recent subgroup founders. The Table below summarizes these founders, dates and locations and is followed by brief biographies. The haplogroups are identified by the labels used in Build 17 of the ISOGG mtDNA tree which can be accessed at http://phylotree.org/ . Dates in the table below have been updated using most recent available dating estimates as described in my previous post deep-maternal-ancestry-and-mtdna.
The migration path out of Africa into Europe of the “grandmothers” linking mitochondrial Eve through to Ursula (U5) is shown on a map in my previous post deep-maternal-ancestry-and-mtdna. The subsequent migration from Europe to Britain is shown in the map below.
Updated biographies of my maternal haplogroup great* grandmothers follow below.