I’m really curious how the math works for where you think people can retire as soon as their kids start working. Retire at 50? Get kids at 40? Start working at 30?
Sometimes, but they only work for so long. Mostly just bring plenty water and power through. Every stint is about 4 hours of driving, and then drivers change.
Inversion thinking also works the other way around. If you see negatives most of the time (which is a strong suit by itself, but the pitfall is that you don’t dare to take any risk), it can help to sometimes consciously think “What if it goes right?”
You don’t need a lot, or even any exercise, to prevent overweight. Diet is everything. The amount of extra calories you can eat for a run is easily outweighed by the extra hunger.
I would make sure the solder connection between wire and resistor is very solid, and then encase the stuff in heat shrink tubing with glue in it. (Adhesive Lined Heat Shrink Tubing)
AA batteries can supply plenty current, the question is for how long.
You need about 1.3 Watt for 30 LEDs (I’m assuming 15 mA, 3V). A rechargable AA battery has about 2.4 Wh according to Wikipedia, so 6 AA batteries will last you 2.4Wh * 6 / 1.3W = 11 hours.
I have no idea how curing works, but 1.3 Watt feels very low. That amount of power is fine for visual lighting, or for signals (turn on a TV), but energy wise it’s very little.