That is a beautiful picture, and it looks like you're having a lovely time! Plus, I can show my wife that I'm not the only one who brings a calculator on vacation!
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Yes, in fact before I got my DM42 I had one holiday where we had no internet access in the evenings and as the children were small and slept early, I didn't have much to do but I was able to learn a lot about using and programming free42.
You beautiful nerd, you! Don't change :)
The glass is interesting. Metal?
Yes, looks like coated aluminium - not unlike a can but a little thicker and with no sharp edges. I've not seen these before but I think they are disposable/recyclable - i.e. a replacement for a plastic cup and far more pleasant to drink from. I took mine home as a souvenir, but I have had to unsquish it today taking it out of hold luggage.
Is it difficult to get used to RPN?
Not really, it's harder to get used to algebraic calculators again after being used to RPN than it is to get used to RPN
Go FORTH and learn....
You do have to remind yourself at the beginning that you're using RPN, but after a while it feels a bit like working sums out on paper.