Boiling Water Using Sunlight

Fresnel Lens used to BOIL WATER WITH SOLAR POWER

"Some of our more powerful lenses can boil 12 ounces of water in under 30 seconds with the aid of an evacuated solar tube and bring one gallon of water to a raging boil in under 30 minutes."
https://greenpowerscience.com/

"Researchers at Rice University have devised a way to boil water using only sunlight - and small carbon or metal particles, which are smaller than a wavelength of light, which reflect the sun's rays and heat the water. The particles' heat is concentrated near the water's surface, creating a vapor bubble - and producing steam. In this way, only a small portion of a container of water must be heated in order for the liquid to boil - a small enough portion that sunlight alone can do the trick. The notion is a radical departure from traditional boiling, which requires that the entire container be heated."
https://www.zdnet.com/article/how-to-boil-water-using-only-sunlight/

"Developed by British engineer James Bentham, the Solar Kettle can boil water simply by using sunlight."
https://newatlas.com/solar-kettle/27594/