Tuesday Links 25-Sep-2018: Dickinsonia is an animal!, demography of poverty, China US rivalry, Insitome and Ezra Klein podcasts

I accidentally sent out a blank version of this post earlier today. Sorry if you subscribe by email. Below is the intended post. Also, I usually post on Saturdays. But skipped a weekend due to travel. Hence I’m sharing the good links below with a catch up, mid-week post. On to it!

image source: Dickensonia from wikipedia

1. Dickinsonia is an animal. Based on wikipedia dates, below I created a timeline for life on Earth. Earth formed 4.5 billion years ago. And by 4 billion years ago Earth cooled down enough to form solid rocks, with liquid water. And immediately we get microbes. Then for 3.5 billion years it’s…..microbes, different microbes, other microbes, some microbes that sort of hang out as a single organism but are still very primitive and small, blah blah blah microbes microbes microbes microbes. Eons of lonely microbes. And yes, during those eons the microbes had interesting biochemistry and evolution going on. Bacteria, archea, photosynthesis, prokaryotes, great oxidation event, eukaryotes (hurrah, that’s us). But let’s face it, if you went back in time and looked around, for 3.5 billion years all you’d notice is slime. Lots of lonely slime. There’s a Fermi Paradox hint here of course. The default for alien life is to stagnate at the slime stage until their sun burns out.

earth timeline life dickensonia.jpg

In any case, starting 580 million years ago we see Edicarian life. These are weird sort of plantlike looking things with bilateral symmetry. See picture of Dickinsonia above. They could get big, think 4 feet in length. Shortly after that we get the Cambrian explosion, the start of more familiar looking life: arthropods, worms, sponges, chordates (us). So the mystery has always been whether Edicarian life was a dead end that got overrun, or a precursor/cousin to Cambrian forms.

And now you can see why this new paper is so cool: Ancient steroids establish the Ediacaran fossil Dickinsonia as one of the earliest animals. They took a 558m year old fossil and looked for cholesteroids which only exist in animal life. And they found them! Amazing. First that these steroids could last over 500m years without completely breaking down, and second they could be detected at all. Ed Yong has a good write up. For a more technical discussion, see Jerry Coyn’s post.

2. Demography of poverty. The most important change in the demographics of poverty over the past 50 years has been the rise out of poverty of China and East Asia (orange below), now being followed by India and South Asia (blue below). Here’s an excellent chart by the world bank.

image source: world bank

I also came across this cartogram by Max Roser this week as well, which scales country size by population. You are correct. China and India are big. And Indonesia is way bigger than Australia.

Population-cartogram_World-1
image source: Max Roser Our World in Data

Finally, the Economist weighed as well, noting that sub-Saharan Africa has a rapidly growing population, with the number in poverty still growing (see yellow in the poverty chart above). For more, see these links: World Bank poverty, Max Roser cartogram, Economist on world poverty, Economist on sub-Saharan African poverty.

3. China Is Not America’s Next Great Enemy. Tyler Cowen argues:

If the lack of an external enemy since the end of the Cold War has made America weak and feckless, as some argue, then can the rise of China give America a newfound vigor and sense of purpose? Probably not.

That’s because “[t]he Chinese just aren’t as threatening to Americans as the Soviets were.” I have a slightly more pessimistic view of what’s going to happen. In my view, country cohesion ultimately requires an outside enemy. In this view, China is not that threatening an enemy today. But if American cohesion continues to falter, at some point that internal conflict will seek a scapegoat. And the natural scapegoat is a rising China. So my fear is elite-elite conflict will get so bad we blunder into forcing China into an enemy role. Hopefully we manage to avoid direct war, as during the Soviet era. In any case, Cowen has a point about China not being a existential enemy today. And I hope he continues to be right in the future. link

4. Podcast recommendations. If you are interested in genomics and history, Razib Khan and Spencer Wells are on a roll with their Insitome podcast. I especially liked the latest episode on “arguably one of the greatest human journeys of humankind, the expansion of the Polynesians across the Pacific.” link

I also liked Ezra Klein’s podcast discussion with conservative David French. We need more understanding across the political divides of America, and this episode did a good job explaining each side to the other in a civil discussion. I found a few moments where I got annoyed, feeling my in-group was mischaracterized. But on reflection realized this was a feature, not a bug. link

And that’s all for this mid-week post. Enjoy your week!

 

 

One thought on “Tuesday Links 25-Sep-2018: Dickinsonia is an animal!, demography of poverty, China US rivalry, Insitome and Ezra Klein podcasts

  1. I saw that cartogram too. I hadn’t previously appreciated that India’s population is almost as big as China’s. I was also surprised by the size of Mexico.
    And for what it’s worth, I agree with your explanation of the Fermi paradox.

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