About 9 years ago I had a run-in with stomach cancer. After a few months of chemo and a 7 hour operation I was eventually declared cancer free and have been ever since, but still have to live with the consequences of the treatment and be vigilant for any signs of it returning.

I still suffer intermittent stomach aches, especially in the early hours of the morning, and had a terrible time trying to decide if they were getting better or worse over time.

Our narrative voice is awful at detecting long term trends and tends to overcompensate for particularly good or bad patches so it was impossible for me to judge and I started keeping records of how bad the aches were each day.

Long story short, the average severity was mostly decreasing over time and the average time between bad aches was slowly increasing but it would have been impossible to tell if this was happening without keeping detailed records because it wasn't consistent - some months were much worse than others and completely skewed my perception of long term trends.

While most people hopefully won't ever need to do something like this, it did make me realise just how bad we are at picking up on long term trends so I can definitely see keeping daily records of, for instance, average daily happiness being eye-opening.

An enthralling example of just how good a public speaker Duouglas Adams was and, 30 years later, still relevant and insiteful.

Many years ago I was a technician supporting a few custom programs on thousands of PCs. The developer of one of these programs had added a date check to his code so the program would refuse to run after a set date and each new release would increase this date by a few months so it would stop working after a few weeks if he ever stopped creating new releases. His contract ended and a few weeks later his software, now relied upon by hundreds of sites, stopped working. The contract for the software development was thoroughly checked and legal action against the developer was started but I asked to see if I could resolve the problem in the meantime.

It only took ten minutes with a dissassembler to find the JGT (Jump if greater than) and convert it to a JLT so the software would stop running if the date was before a certain date rather than after. I created a patching tool that simply flipped one bit that was sent out to all the sites and everything was good again. I don't think I'll ever beat the elegance of a single bit flip hack.

I can attest to this from personal experience.

After undergoing stomach surgery 8 years ago I started experiencing completely debilitating stomach aches. I had many appointments with my GP and a specialist leading to endoscopies, colonoscopies, CAT scans, and MRI scans all to no avail and they just kept prescribing more and more anti-acids and stronger painkillers.

It was after seven years of this that I paid for a private food allergy test to find that I am allergic to Soya protein. Once I stopped eating anything with Soya in it the symptoms almost completely vanished.

At my next GP appointment I asked why no-one had suggested it could be an allergic reaction only to be told that it is not one of the things they check for or even suggest. My faith in the medical community took a bit of a knock that day.

On a related note, I never knew just how many foods contain Soya flour that you wouldn't expect until I started checking.