That would also be useful around the Current Puppy.
We need really, really good power storage batteries. Hold lots of power, don’t weigh too much, don’t take up lots of space, can be recharged a lot of times from whatever power source is functional at the time and place, and made out of readily available non-toxic materials.
This is like my answer when physicists claim that as long as all processes are reversible that time travel cannot be ruled out. "So I can toss hot food into the microwave and get 120vac out of the end of the cord?
In the same discussion about batteries, thinking ahead to a future where electric-powered cars are the norm and not the exception, a way to solve the issue of recharging, quickly. Perhaps it will happen naturally on it’s own, but a standard, portable battery pack that all EVs can use. Imagine driving up to a (former) gas station, and they have batteries the size of 5-gallon buckets with convenient handles all charged-up and ready to swap-out your nearly depleted battery from your car (or, batteries) - basically a fill-up in the same amount of time as it takes now. Like the propane tank exchange.
One of the challenges of the EV future is replicating the ubiquitous gas station with charging stations, as well as the time it takes to recharge - having a portable battery standard would ease some of those constraints around convenience and access to fresh power.
I wish that contact lenses came as a gel in toothpaste tubes. In the morning, you squeeze out a pre-measured dab of gel and insert onto each eye. Within 30 seconds the gel would transform into soft contact lens that would last 12 hours and would get flicked into the trash can before bedtime. I guess there are lots of details that would need to be worked out.
I don’t need it anymore but when I was a 14 year old kid in high school having a Swimming class for PE surrounded by 18 year old women, I really would have paid top dollar for swim trunks that could hide your boner.
In fact, I’m fairly certain boner hiding clothing would actually make some money. I can’t be the only one who heard about all the boner hiding tips including putting your backpack in front of your crotch or sticking it in the elastic of your underwear.