The best way to learn about them as of 2020 is to Google into Know Your Meme.

They appear to piece together data from various sources. This is the most complete historical domain -> IP database we have so far. They don't have hugely more data than viewdns.info, but many times do offer something new. It feels like the key difference is that their data goes further back in the critical time period a bit.

TODO do they have historical reverse IP? The fact that they don't seem to have it suggests that they are just making historical reverse IP requests to a third party via some API?

E.g. searching thefilmcentre.com under historical data at securitytrails.com/domain/thefilmcentre.com/history/al gives the correct IP 62.22.60.55.

But searching the IP 62.22.60.55 is empty and there's no historical data option?

Account creation blacklists common email providers such as gmail to force users to use a "corporate" email address. But using random domains like ciro@cirosantilli.com works fine.

Their data seems to date back to 2008 for our searches.

An Introduction to Tensors and Group Theory for Physicists by Nadir Jeevanjee (2011) shows that this is a tensor that represents the volume of a parallelepiped.

It takes as input three vectors, and outputs one real number, the volume. And it is linear on each vector. This perfectly satisfied the definition of a tensor of order (3,0).

Given a basis $(e_i,e_j,e_k)$ and a function that return the volume of a parallelepiped given by three vectors $V(v_1,v_2,v_3)$, ${\epsilon }_{ikj}=V(e_i,e_j,e_k)$.

This looks a lot like the beans that Brazilians venerate and can be easily found in the United Kingdom as of 2020.

The more exact type seems to be pinto bean, but this is close enough.

2021-03: same but 2.5 teaspons, seems to be the right ammount.

2021-02-10: attempt 3: 500g 1 hour 30 minutes no pressure, uncontrolled water. Salt with one chorizo: put 3 teaspoons, it was a bit too much, going to do 2 next time and see.

2020-12-14: attempt 3: 250g of beans, 1.5l of water, 30 minutes pressure.

2020-11-30: attempt 2: 275ml of dry beans, about 50% of 500g bag, putting 1650 ml (6x) of water on pressure cooker Still had to throw out some water.

Density dry raw: 216 g/250 ml = 432 g / 500 ml = 500 g / 580 ml = 864 g/L

500 g dry expands to in water after 12 hours: 1200 ml

Therefore 500 g dry = 864 / 2 L = 432 ml expands about 3x.

Therefore, to the maximum 2.5L of the cooker with 8x dry volume water from this recipe I can use:and so:which is about 227 / 580 = 40% of the 500 g bag.

After first try, I found that 8x volume of water is way, way too much. Going to try 6x next time.

It is hard to beat the list present at Quantum computing report: quantumcomputingreport.com/players/.

The much less-complete Wikipedia page is also of interest: en.wikipedia.org/wiki/List_of_companies_involved_in_quantum_computing_or_communication It has the merit of having a few extra columns compared to Quantum computing report.

Also of interest: quantumzeitgeist.com/interactive-map-of-quantum-computing-companies-from-around-the-globe/

When Ciro finally understood that this is a play on Larry Page's name (of course it is, typical programmer/academic humor stuff), his mind blew.

A young Ciro Santilli really liked this game, the way it makes you feel.