Decision diagrams

My suburb has a charity second hand bookshop.

Today I found -

The Decision Book by Krigerus & Tschäppeler (ISBN 978 1 84668 395 4).
Some of the models in it would have been useful to me long ago:
E.g. The Eisenhower Matrix - How to work more efficiency.
Some are useful to me now:
E.g. The Black Swan Model - Why your experiences don't make you any wiser.

As an engineer I love the diagrams.
As an Australian I object to the meaning attributed to the expression "black swan" - black swans are very common around here.

Black Plum Lover

I have a large fruit tree in my garden a burrpurr (also called Diospyros australis or black plum).

Unfortunately it gives no fruit - it only has female flowers. Today I went looking in a native nursery for another tree - a male.

The nursery is famous for its native plants and once featured on the national gardening show. Now it is a sad site - with a much reduced range and much empty space. So many plants looked half dead.
The healthiest plants appeared to come from a commercial wholesaler.
There were three Diospyros australis. I bought the only one that looked like it might survive, it could be male or female.

///unlocks.wafer.frail

With three words you can give an accurate location anywhere on earth.

The app that tells you the words is called what3words.

But you need
1) a charged a mobile phone with what3words installed.
2) a working GPS
3) a means of communication.
So it would not help Tom Hanks in Castaway.

A Grilled Burger

Eating a burger would, I suppose, not be worth writing about - usually. But We have not eaten out for 2 months -it's worth celebrating the lifting of social restrictions in the effort against the new virus.

On the radio, an announcer mentioned that many people had written to her saying how traumatic the lock down has been for them. But my beloved and I have not found it so. We have spent a lot of time around the house and with each other. Going out for groceries was a major expedition with hand wash and gloves.

Most meetings I used to go to went on too long - meeting over the internet is easier and you can surf the net if the conversation is irrelevant. I was not a person who needed social gatherings and parties.

I finished a couple of books that were on my reading list for years. I weeded the garden and tidied my hobby space. Altogether it has been a productive time for me.

I realise that I have not been taking children through school lessons and I have not been worried about loan repayments or job security.

Finished with Colour

Today I finished a book I started before the corona virus lockdown-
Colour by Victoria Finlay.
I enjoyed it very much. As I read the last chapters Indigo and Violet I was struck by how the author was freely travelling the world, something not possible today.

It is a large book (in a slipcase even), but what should I do with the book next. i am unlikely to read it again. I KNOW!- I will build a street library and give it away.

Ring your mum.

In the 1980s I did teletraffic design in regional Queensland- I decided the number of connections between and within telephone exchanges. This determined the number of calls that could be made at once.
For a small 90 line exchange this might be 4 internal calls, six outgoing calls and five incoming calls at one time.
The numbers were determined by measurements of the number of calls and mathematical analysis. The Erlang Loss formula which is recursive and probabilistic was the main tool. In the early days of personal computers I wrote a program to calculate the Erlang loss using the Pascal language.
I would be considering if a single telephone exchange should be able to make seven or eight outgoing calls at one time.

The units of measurement were Erlangs - One Erlang was one current call.

The busiest day of the year for phone calls was Mothers' Day. Everyone phoned their mum even though calls were expensive and if the network was congested they would try again.

Wi-Fi No Go

I figured out that I could make a free Wi-Fi hot spot with some unused components from around the house.
But with some research I found out that if I provided a free Wi-Fi point then I would need to provide additional security or risk security breaches for my home system and any users.
Security is serious - so no free Wi-Fi was implemented.