Most solar power devices are made from silicon, which cannot respond to light less energetic than the near infrared. So some parts of the light spectrum are going unused when it comes to solar power. But clever researchers at UNSW in Australia have worked out how to combine semiconductor quantum dots to absorb low energy light with molecular oxygen to transfer light to organic molecules - making it possible for normal silicon devices to operate.
Under development since 2017, this liquid metal battery (LMB) is about to be let loose on the globe. Consisting of 3 liquid layers; 2 of molten metals and a middle layer of molten salts. The system is self-heating and insulated, but contains no combustible materials - so they can't burn. And they retain all of their charge capacity for at least 5000 cycles (think decades, not years). Modular, safer and cheaper than lithium-ion batteries. https://ambri.com/technology/