What is SPF and how much sunscreen do you really need?

Skin cancer is the most common cancer in the US and while sunscreen abounds in aisles, many aren’t applying it correctly

The sun has given us so much. Flowers, for example. Also sunsets, vitamin D and the 2002 Sheryl Crow hit Soak Up the Sun.

And yet, despite its brilliant generosity, humans must also diligently shield themselves from the sun lest its ultraviolet rays inflict damage on our soft, fallible bodies. Among our most powerful defenses? SPF products.