81 today, recovery from hip surgery going well, chemistry writing re-editing going ok, 'matron molly' tells me off for sitting too much in front of computer, but discipline is improving with regular 'physical' exercises! hope all is well with you all, luckily I feel OK about life

Just recovering from hip surgery. Excellent example of material science, metal alloy ball and plastic socket. Many thanks to the wonderful NHS staff, so kind and patient at the Friarage hospital in Northallerton, Northern England. Back to www chemistry work very soon.

Next spectra Q docbrown.info/page06/spectra… mass spec should sort which halogen, as ever, enjoy! doc b

Another spectroscopy problem, docbrown.info/page06/spectra… should be quite easy for UK A-level and US grade 11-12 students to solve. Weather continues to be really good in North Yorkshire, England and Middlesbrough beat Wrexham 1-0 in the English League Cup, well done 'the Boro'.

Hi Tim, thanks for your comments. I avoided the empirical formula calculation so the students have to concentrate on the spectra. Students will have been doing empirical formula calculations well before tackling spectra.

Started designing molecular spectroscopy problems to deduce a molecular structure. 1st problem to solve is docbrown.info/page06/spectra… any +/- comments will be appeciated, just trying to make more use of the hundreds of spectra I've analysed.

Sorry, forgot to say Farndale!!!

A bank holiday in Ireland today to mark St Bridget's Day, which was last Sunday. Well done progressive Ireland to gender equalise with St Patrick's Day! Heading for Dublin soon!

Trump is a bully and deeply undemocratic and such a hypocrite. The future of Greenland is up to the Greenlanders and Denmark. Most people in the US should be ashamed over his attitude, but maybe not?

I wish you all a Happy Christmas and look forward to a New Year of much needed peace around the World (maybe?). By the end of Boxing Day, the old Victorian schoolhouse will be full of family and warm - no expense spared to heat the thick stone walls! Best wishes to all doc brown.

In Brazil, many young people won't drink alcohol cos of fear of fake drinks with toxic methanol & ruins their social lives. Why do we rely on alcohol to enjoy a good social life? For med'l reasons I don't drink, my family drink little if at all, all still enjoy a good social life

The internet e.g. google AI says 3-ethyl-2-methylpentane has a chiral centre and can form R/S isomers, I say NOT, who is correct?

🚨 The Treasury is threatening our national parks. Dartmoor, the Lake District & wild places could be bulldozed for development. Once gone, they're gone for ever. Join me and sign now to protect them: 38d.gs/ftnt

80th birthday today, docbrown.info/page06/isomers… so finally finished an analysis of isomers of C4H8O2, identifying at least 102 constitutional isomers and 154 stereoisomers, enjoyed the exercise, and the reast of the day with cake and friends

Trying to get back into videoing steam trains, just going back to childhood in the 1950s! For the nurds it is a 2-6-0-mogul steam locomotive built by British Railways in 1954, running on the North Yorkshire Moors Annual Steam Gala in 2025 docbrown.info/docspics/nymr/… Does it run OK?

Intellectual exercise, worked out as many isomers as possible (actual or theoretical) for formula C3H6O2 docbrown.info/page06/isomers… at least 33, very satisfying, x-ref errors on internet (particularly as I'm 80 in a week's time), corrected co-pilot & gemini lately, thanks & apology!

Detailed re-editing page on isomers of C2H4O at docbrown.info/page06/isomers… and also selected isomers of C2H4O2 at docbrown.info/page06/isomers… , as ever enjoy!