Visualizing spacetime

One of the insights of the general theory of relativity has been to change our understanding of the relationship between gravity and spacetime. We now say that mass has the effect of distorting spacetime and it is that distortion that causes other objects with mass to move in ways that formerly we used to describe as being acted upon by a gravitational force that could act at a distance.

But visualizing that distortion of spacetime and its effects is not easy because the distortions are not visible in the three spatial dimensions that we can ‘see’ and must be described mathematically.

However, this video makes a valiant effort.

Cars powered by sea salt batteries

As the move from gasoline to electric cars gains steam, there is an increasing demand for batteries and the raw materials like lithium, cobalt, and nickel that make them up and the competition for those fairly rare resources is becoming fierce.

So I was pleased to learn that there is an alternative battery power source that is made from plain old salt.

Lithium – the main component in most electric batteries – can be costly to mine. But researchers have made a breakthrough with alternative ‘molten salt’ batteries.

Your electronics could soon be powered by an ultra cheap sea salt battery.

Researchers have built a new cheap battery with four times the energy storage capacity of lithium.

Constructed from sodium-sulphur – a type of molten salt that can be processed from sea water – the battery is low-cost and more environmentally friendly than existing options. 
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Julian Assange finally walks free

He is now back in Australia, after years of being hounded by the US government that was angered by Wikileaks publishing documents that showed the horrific abuses by the US in Iraq, such as the Collateral Murder video leaked by Chelsea Manning of US forces in a helicopter gunship mowing down unarmed civilians in a street, after the gunners misidentified the camera equipment they were carrying as weapons.


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Debate mind games

The first debate between Joe Biden and serial sex abuser and convicted felon Donald Trump (SSACFT) will be held on Thursday from 6:00-7:30 pm (Eastern Time) in Atlanta, GA in the studios of CNN that is hosting the debate. It is not clear if CNN is only streaming it on its own cable channels. If so, since I do not have cable TV nor do I subscribe to CNN, I will not be able to watch it live and will have to see it later when (if?) it is streamed online.

We are currently in the familiar game of setting expectations. Each side will of course claim victory whatever happens but beating expectations is one important metric that is used and is easier to do if each side sets a low bar for their own person and a high bar for the opponent.

SSACFT’s team and their right-wing echo chamber have had to do some serious contortions because I think that they really are afraid of what the debate might show. For the longest time they have been portraying Biden as doddering, drooling, and senile. But that hurt them when he turned in a feisty State of the Union speech and so now, fearing that this will happen again, they have started repeating the mantra that he was on drugs then and will be so again. There is zero evidence for any of this but that has not prevented them from spreading lies before on any number of issues so why stop now?
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Cricket World Cup update

The T20 World Cup now entering its final stages has seen some major surprises. One of the biggest was the rank outsider US team beating perennial powerhouse Pakistan in its group game. That proved pivotal in taking the US to the second round of just eight teams of the 20 that started out, with Pakistan not making it. Then we saw another powerhouse New Zealand get completely routed by Afghanistan in their group game, enabling the latter to make it into the final eight while eliminating the former.

In the games involving the final eight teams, Afghanistan pulled off another shocker by beating Australia, the team that, along with India, were favored to win the tournament. They then went on to beat Bangladesh, propelling them into the semi-finals where they will play South Africa. The other semi-final will be between India and England.

It is clear that Afghanistan is the Cinderella team of this tournament and one hopes that they can keep pulling off these upsets and beat South Africa and then whoever they meet in the finals.

Rishi Sunak’s hapless election campaign

The British prime minister gambled when he dissolved parliament and called elections for July 4th when he was about 20 points behind in the polls. For him to succeed in spite of that handicap would require everything to go right for him. And yet, there has been one thing after another that seems to be dragging him down.

It started with the announcement itself when a sudden downpour began when he was in the middle of delivering the news of parliament dissolution to the assembled press outside Downing Street. If the rain had started before the speech he could have changed the venue or the time. But since he had already started speaking, he had little choice but to gamely continue while getting soaked. It was not a good look and was considered an inauspicious start. Things have not gone better for him since.
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Trump’s second term agenda

Serial sex abuser and convicted felon Donald Trump (SSACFT) has made all manner of statements about what he wants to do if he should be re-elected in November. But while he was erratic and chaotic during his first term, there is a well-organized group that is working to create a detailed agenda that will provide a blueprint that they want him to implement. It is called Project 2025 and it calls for the steady dismantling of many of the checks and balances that prevent ideologues from using the government as if it were a private company run by a CEO who can make unilateral decisions that will affect the entire population.

On his show Last Week Tonight, John Oliver looks at who is behind Project 2025 and what they seek to achieve. It is not good.

Interesting insider view of UK politics

As the UK heads into its general election on July 4th, David Remnick had an interesting interview with Rory Stewart who was at one time an ambitious Conservative politician and member of parliament in the UK, intent on climbing up the leadership ladder and someday becoming prime minister. He had all the pre-requisites for a Conservative party leader, coming from a privileged family, attending an elite private school (Eton) and then Oxford University, and he quickly rose up the party ranks after he first became an MP in 2010. He competed for party leader in 2019, losing to Boris Johnson.
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Lessons of Covid for the next pandemic

Public health experts say that another pandemic is inevitable, that it is not a question of ‘if’ but when and what form it will take. So what lessons have we learned from the Covid-19 pandemic we just had (and that still lingers on) that we can apply to the next one?

Clearly scientists and health experts were scrambling to contain the virus and various measures were adopted, not all of them successful. Some will depend on the nature of the virus itself and how it is transmitted. If it is in the form of droplets that fall, then physical distancing will help though the distance required may be different from the six feet that we were told. If the virus is transmitted in the form of aerosols that float through the air and linger longer, distancing may not help. But in either case, masking helps but only if we use high quality N95 or KN94 masks and not the paper or the homemade cloth ones. So having a stockpile of those good masks at the ready to hand out to the public would be a good idea.

Avoiding crowded indoor spaces where lots of people gather is also recommended. If one has to be indoors with others, it would be better if the place is well ventilated.

Working at home, if possible, is probably beneficial. When it comes to closing down schools, offices, and restaurants, the cost-benefit analysis is more complicated.

One positive thing that came out of this pandemic is that scientists seem to have developed new techniques to quickly identify the nature of the virus and develop vaccines for it. Of course, that will not help much if the same nutters who opposed vaccinations the last time around are still vocal.

Kevin Drum provides a comprehensive list other the measures that were taken and how effective they were.

Ok is not ok?

I feel that it is a basic act of courtesy to acknowledge, however briefly, when someone has communicated with you via text message. So if they send me some information, I often will just say ‘Thanks’. If they have made a suggestion to which I agree (“Let’s meet at 10:00am”), I will reply ‘Ok’. If they ask me to confirm some choice (“Shall I come at 10:00?”), I will reply ‘Sure’.

I notice that some of the people will use the thumbs up emoji instead of words. But I am not an emoji kind of guy and felt that my words conveyed the same sense of agreement or acknowledgement.

But I am not an expert on social media communication and recently I was listening to a radio program and someone said that just replying ‘Sure’ was bad, in that it implied sarcasm, as if I had said ‘Yeah, sure’ in a disdainful voice. However, I was assured that ‘Sure!’ was fine.

She then went on to say that ‘Ok’ was even worse than ‘Sure’, which startled me since that is my most frequent from of acknowledgment.

I am not sure how universal this sentiment it. The mores in the world of online communication can change rapidly over time as well as vary a lot from person to person, so maybe ‘Ok’ and ‘Sure’ are ok despite what the speaker said.