TED-Ed: Why do we have to wear sunscreen? - Kevin P. Boyd

The video discusses the sun's benefits and dangers, emphasizing the importance of sunscreen to protect against harmful UV rays. It explains the differences between UVA and UVB rays and their effects on the skin. The video describes physical and chemical sunscreens, their functions, and the necessity of using sunscreen to prevent skin cancer and premature aging. Practical tips for sunscreen application and recommendations for daily use are provided.

What is the primary purpose of sunscreen?

• To cool the body

• To moisturize the skin

• To shield the body from ultraviolet rays

• To enhance tanning

Which type of ultraviolet rays is known to cause skin burns?

• UVB

• Infrared

• UVA

• UVC

How do physical blockers in sunscreen work?

• They neutralize the sun's rays

• They enhance the sun's rays

• They reflect the sun's rays

• They absorb the sun's rays

What does SPF in sunscreen measure?

• Protection from UVB rays

• Moisturizing effect

• Protection from UVA rays

• Cooling effect

Why should children under 6 months avoid sun exposure?

• Their skin is too dry

• Their protective mechanisms are not fully developed

• They are immune to sunburn

• They tan too easily

What is a major aesthetic reason for using sunscreen?

• To prevent hair loss

• To avoid premature aging

• To enhance skin color

• To reduce body temperature

What is recommended for effective sunscreen use during prolonged sun exposure?

• Apply only on cloudy days

• Use only after swimming

• Reapply every 2 to 3 hours

• Apply once in the morning