Or rechargable batteries. Even lithium ion batteries weren't better than state of the art NiMH batteries when they first came out in the 1990s. Evolutionary imp

Or rechargable batteries. Even lithium ion batteries weren't better than state of the art NiMH batteries when they first came out in the 1990s. Evolutionary improvement let us develop quadcopters, e-bikes, e-scooters, electric cars, smartphones, e-cigarettes, tablets, and countless other devices that simply weren't that practical 3 decades ago. And this process continues.