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There are 365.2422 days in a Solar year. The average Gregorian calendar year has 365.2425 days. There is a 0.0003 day difference between the Gregorian and the Solar years. For this reason the Gregorian calendar will advance 1 day every 3,333 years.


A quick visit to the CERN Control Centre (CCC) where our nice host was having fun highlighting what already runs and will soon run on #kubernetes, and what can happen when things break 🙂

Also something i did not know existed… the LHC Announcer page:

We should add a countdown to beam injection 🙂

The Cistercian numerals

The Cistercian numerals are a forgotten number system, developed by the Cistercian monastic order in the early thirteenth century, much more compact than Arabic or Roman numerals: with a single character you could write any integer from 1 to 9999

New logo

In 1971, Nike hired a student to create a logo. She was paid $35 for her design.

Carolyn Davidson was a graphic design student.

She needed cash and was offered $2 an hour for her work.

She was paid $35, after creating the design in about 17 hours.

She later received 500 shares after Nike’s IPO, which she never sold.

No more Google pay

The diagram below shows the differences. Both approaches are very secure, but the implementations are different. To understand the difference, we break down the process into two flows.
  1. Registering your credit card flow
  2. Basic payment flow

1?? The registration flow is represented by steps 1~3 for both cases.

????? ???: It doesn’t store any card info. It passes the card info to the bank. Bank returns a token called DAN (device account number). iPhone then stores DAN into a special hardware chip.

?????? ???: When you register the credit card with Google Pay, the card info is stored in the Google server. Google returns a payment token to the phone.

When you click the “Pay” button on your phone, the basic payment flow starts. Here are the differences:

????? ???: For iPhone, the e-commerce server passes the DAN to the bank.

?????? ???: The e-commerce server passes the payment token to the Google server. Google server looks up the card info and passes it to the bank.

In the diagram, the red arrow means the credit card info is available on the public network, although it is encrypted.

Over to you: Apple needs to discuss the DAN details with banks. It takes time and effort, but the benefit is that the credit card info is on the public network only once. If you are an architect and have to choose between security and cost, which solution do you prefer?


A moment (momentum) was a medieval unit of time. The earliest reference to it is from the 8th century and since 1 hour = 4 points = 5 lunar points = 10 minutes = 15 parts = 40 moments, one moment corresponds to 90 seconds [source, read more:]

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