When I batch cook I fill portions of hot food into glass jars with screw lids and keep them in the fridge. (Those glass jars contained yogurt when I bought them, when I need more I buy more yogurt and eat it)
Each jar is 1/2l so a good size for one portion and I only open them when I take them out of the fridge for usage. By filling hot, keeping cool and not opening them (so introducing only few microorganisms) they stay OK for at least a week.
Fuck, Germany introduced unleaded fuel only in 1984 and still offered leaded fuel for a long time.
It was required because of the introduction of catalytic converters, which would get damaged by lead in the fuel.
When I was at Bundeswehr I was in hospital for some time and got some thorough diagnosis. They asked me if I worked with lead in the past (no), so I seem to have at least some lead levels in my body.
(Can’t think of a I AM NOT CRAZY pun right now)