ELI5: Explain Like I'm 5

Passive daytime radiative cooling

Passive daytime radiative cooling is a way to cool down a space without using air conditioning or any other type of cooling system. It works by shining a special type of light onto the roof of the space. This light reflects the sun's rays away from the roof, creating a cooler temperature inside the space. So even when it's hot outside and the sun is shining, this way of cooling can help to keep your space feeling cool and comfy.