A fellow tea drinker! It is perhaps the one dietary habit that I've never regretted taking on. All things in moderation, of course... but tea is truly something

A fellow tea drinker! It is perhaps the one dietary habit that I've never regretted taking on. All things in moderation, of course... but tea is truly something special. It's funny that you mention helmets, actually. For years when I was younger I could not afford a car, so I had to get by on a motorcycle. I worried about safety for years only to one day get plowed through, in broad daylight, at an intersection, by some fool trying to run a red light! Needless to say... they never noticed my hi-vis gear. There is no doubt in my mind that I would be dead today had I had not been wearing a helmet. If by some miracle I did survive, my face would have been completely scarred beyond recognition. There is no moral to this anecdote of mine -- a helmet saved my life, but even I have to admit that helmets aren't always practical. I've long since moved somewhere where I never have any need to drive... yet even now I will occasionally rent one of those sidewalk scooters and zip around on a whim (usually without any helmet, naturally). This is all to say that I agree with your stance that perfection is impossible. There's always more one could do, so we all have to draw our own lines somewhere that makes practical sense. It's why I'm very evidence-oriented when it comes to how we communicate about these things -- that's the only way to help others make informed decisions and avoid future regrets. On that day, it wasn't overly inconvenient to wear a helmet... so I wore it. This half-hearted choice is what ultimately saved my life. I wish you luck in developing your course. Teaching is the highest calling that there is and I have trust in you to do it well. My (unsolicited) advice is to take an iteration-first strategy and allow the content to develop organically as you explore it with your pupils. In my own (limited) experience, teaching is not all that different from the scientific method -- it works best when starting from a position of being willing to accept any and outcomes.