The sun is an enormous ball of flames that tends to hover in the sky during daylight hours, producing useful light particles that allow us to look at objects.
At night, the sun runs out of fuel and plummets into the Atlantic ocean, where it is turned into carbon dioxide by the people of Atlantis.

Of course, that is absolute nonsense. If you wandered around ASDA's bread aisle all day shouting that, you would certainly get some funny looks!
But amazingly, that is exactly what the people of Ancient Rome believed - and despite the warnings of Aristotle, they didn't realise that along with its useful light particles, the Sun also expells terrible death rays! That's why the people of ancient Rome all died of either skin cancer or when that volcano blew up and killed eveything, including the dinosaurs.

Today, thankfully, science has the answer to defeating the Sun's deadly rays: sunscreen!
If you've ever wondered exactly what sunscreen is, sunscreen is some sort of paste.

The most people applying sunscreen occured in an advert I saw on television several months ago. There were at least three bus loads of people in that advert.
It was probably an advert for sunscreen.

Or ice cream.