Their isn’t one way to make a flat head screwdriver. Some a chisel and some are slots. The slotted ones are better but more expensive.

Both still slip from the screw and are a pain to manually screw (slotted less so).

Pozi is the best + type screw. It’s pretty much standard for UK construction. The only time a different type is used is sometimes Phillips for plaster board or external hex and internal torx for long or large screws.

A glass may have a spec that allows it to be filled to the brim. Doesn’t mean it’s a good idea, especially when you want to run up stairs with it.

Your going to spill water everywhere.

Your not doing your own research. Your likley not capable of doing such research. Your doctor also isn’t doing their own research. Your doctor does take the knowledge and guidance from those that do research after they’ve done it and it’s be reviewed and validated by national healthcare standards agency.

Much like documentaries much of the available information online that’s accessible and engaging is just entertainment wrapped packaged like your learning something. Especially when your sources lead you to think herbal medicine is a better alternative.

The stuff that works in herbal medicine have been studied and improved in modern medicine. The two can’t and shouldn’t be equated. Anyone claiming herbal medicine should be respected and not condemned is a crook and/or idiot. Most proponents are crooks, trying to sell things they know or don’t care if they work.

Things like paracetamol and lithium have a basis in herbal medicine. Paracetamol was improved to stop the horrendous damage the herbal medicine did to your kidneys. Lithium was quantified and controlled to minimise the impact of taking a toxic mental (Lithium was sold as natural healing waters found in springs, it was scientist investigating these waters that identified lithium as an element), newer less toxic medicines are now available for these conditions.

Medicine displaced herbal remedies. The regulation of medicine means the only practionationers of herbal medicines are unregulated crooks.