As far as we know anti-atoms (antihydrogen in this case) are as stable as normal atoms.

To the point where it creates interesting questions -- if antiatoms are exactly as normal atoms, why we have abundance of normal matter but not antimatter?

Ie mobile platforms that are essentially defenceless on their own but carry large armament of drones and other electronic devices inside enemy territory that is meant to quickly take over surrounding space (surface and overhead) and do quick job of neutralising various threats like enemy personnel, drones, etc.

But I am not sure about that. Planes require a landing strip to start from and large hangars to store them and that drove the basic form of aircraft carrier.

There is no such limitation for electronic equipment and small drone carriers travelling on land. And I think, rather than presenting a single high value target to the enemy, it makes sense to have a lot of specialised units functioning as one through information systems that cannot be disabled with a single successful strike.

The whole point of tank, as the word suggests, is to be able to survive enemy fire.

With proliferation of easy to carry weapons that can pierce any tank it is largely relegated to being heavy, costly and fragile mobile cannon that needs a lot of support to stay alive. There are much better devices that can fill those roles.

You should no longer assume that you can ambush anything with your tanks -- with live overhead feed it is easy to spot any tanks encroaching on your position and place any antitank in the right spot.

And then you have drones that you can basically point and shoot any tank from.

I am pretty sure this is the last war where we see large number of tanks involved. Every country that is watching this is click spamming to buy as many drones as possible.

You made up a number with no grounding in reality because of your bias due to being "general public".

For corporate services it is actually quite common to use client certificates and mutual auth. Also popular with VPNs.

You might not be aware of this because corporations do not want to deal with people who do not know or can be forced to know how to generate signing request.

This is different when you control both the service and the users of the service and you have something valuable to protect.

As an example, I worked with credit card terminals and these used mutual auth with properly managed client certificates.

You wouldn't call DOS on all terminals and ATMS "insignificant".

There is a huge number of public facing services that implement mutual auth and all those are potentially vulnerable to DOS. While clients can just decide to not connect to a web service that causes their browser to malfunction (and why have you connected there in the first place?), services are usually not at liberty to ignore a client at this stage.

So yes, those servers that do request client certificate are targets and my point still stands that servers are much more affected than the clients.

What would be an affected client? You keep connecting to this infected website that causes your browser to die? Somebody embedded some tracking on their page that now points to an infected website? Everybody will just move on and it is hard to say you are very much affected by this problem.

Whereas if you are a service and you are affected you absolutely need to implement a fix.

Actually, it is the opposite.

You seem to be unaware of the fact that servers do receive certificates from the clients which are then parsed.

Which is already mentioned in the advisory document:

  "Thus vulnerable situations include:

   - TLS clients consuming server certificates
   - TLS servers consuming client certificates <---- here
   - Hosting providers taking certificates or private keys from customers
   - Certificate authorities parsing certification requests from subscribers
   - Anything else which parses ASN.1 elliptic curve parameters"

We are all dependant on very fragile balance of various mechanisms that we do not fully understand.

For example, European climate depends very much on the mass of warm water transported by Gulfstream. Europe would be basically north Canada if not for all that warm water and precipitation that comes with it. But we also know that this stream itself depends on the water cooling up north and sinking to complete the cycle. If the water can't cool the cycle will be broken and Europe may suddenly change the climate dramatically at an astonishing rate.

I am not worried about plant and animal life -- these will migrate or adapt. Nature has always found a way in the past.

What I am worried is human toll, masses of people affected by rapid climate change that are unable to fend for themselves.

Carbon cycle is fine.

The problem is there is a huge amount of additional carbon that the cycle cannot accommodate. If I remember well, every decade we are adding more carbon than entire weight of biosphere.

Also, plants have higher albedo than most types of ground. Remember, they are built to capture light. This means they cause Earth to capture more energy.

Plants don't do much to atmospheric carbon if they can't be sequestered. Otherwise they just burn or rot -- causing carbon to return back to atmosphere.

The conditions for the plant carbon to be sequestered are not favourable nowadays.

I love plants and I want more plants and trees and all that. Just don't be naive thinking this is going to solve the problem.

Because that naivety more often than not causes lay people thinking something is being done when trees are being planted which is bad for us who would like something real done.

https://en.wikipedia.org/wiki/Solar_gravitational_lens

I predict in couple decades we will learn to build swarms of drone craft that we will send to the right location and they will be able to image nearby planets (one per swarm...) with at least ~10-40km per pixel if not better.

This photo is not a happy accident, though. It took careful preparation.

Let's see... it looks that at a distance of 400km we can see features of size roughly 1m (or even better). This points to resolution of 0.01 arcsecond which is fenomenal for an amateur setup.

20% is for uncharged, non-rotating BH. 42% (maximum) is for rotating black hole.

I have to agree with 20%. 42% assumes that you are robbing the black hole of its momentum and that cannot be sustained infinitely, as you are throwing more and more stuff into it your best possible efficiency will drop asymptotically to 20%.

Requirements is a communication problem.

You can help your engineering by making sure ideas are correctly named, that definitions stay true to principles and the same throughout the company.

When software is built on immutable principles then it hardly ever needs to change because principles do not change (or they are not principles).

I have worked developing various banking systems. Most of the time it is not requirements that change, it is people discovering they have different definition of something that other people have and the change is to accommodate differences in understanding.

Compared to stars, this process is much more efficient and allows converting something like 40% of mass of dropped object into energy.

And so with this mechanism we have much more energy available than all stars in the universe have and will ever have produced. Not only that, we can do it at any rate we want. Rather than radiate 99.999999999999999999999999999999999999999999% of it uselessly, we can make sure that most of it is used to power our civilisation.

The problems:

1) The visible universe shrinks, so much less matter will be available to us in trillions of years.

2) Before you drop matter into black hole you need to store it somewhere. The issue here is that over long periods of time orbits decay as gravitational energy is radiated away and so keeping mass in storage actually requires energy to be added.

3) Not gonna save us from Big Rip.

Then Russians cried foul when the bigger bully betrayed them. Unfortunately allies could not let Nazis overrun Soviets because with access to oil fields Nazis could make Europe their fortress.

And so Soviet crimes were overlooked in the name of greater good.

Also, a mirror flying through space is very hard to detect. It reflects very well but only in some directions meaning it is basically black when looking at it from any other direction.

https://en.wikipedia.org/wiki/Lorentz_factor