Sunscreen typically protects against UV rays for about 2 hours. However, this can vary depending on factors such as the SPF level, sweating, swimming, and the amount of sunscreen applied. It is important to reapply sunscreen every 2 hours, or more frequently if you are sweating or swimming, to ensure continuous protection against UV rays. **

To protect oily skin from sunscreen, it's important to choose a sunscreen that is labeled as "oil-free" or "non-comedogenic" to avoid clogging pores and causing breakouts. Look for a sunscreen with a lightweight, gel-based or matte finish formula that won't leave a greasy residue on the skin. Additionally, consider using a mattifying primer before applying sunscreen to help control excess oil production throughout the day. Finally, be sure to cleanse the skin thoroughly at the end of the day to remove any sunscreen residue and prevent buildup. **

Wearing sunglasses can help to partially conceal one's identity by covering the eyes and part of the face. However, it may not be enough to fully protect one's identity, especially in situations where a person's entire face is visible or if they are being actively pursued by someone trying to identify them. Other factors such as clothing, body language, and other distinguishing features can also contribute to identifying a person. Therefore, while sunglasses can provide some level of anonymity, they may not be sufficient on their own to fully protect one's identity. **

No, vampires do not protect themselves from the sun with sunglasses. In vampire lore, sunlight is typically harmful to vampires, causing them to burn or disintegrate. Vampires usually avoid sunlight altogether by staying indoors during the day or using other methods such as cloaks or umbrellas to shield themselves from direct sunlight. Sunglasses would not provide sufficient protection from the sun for a vampire. **

Sunglasses should protect against excessive brightness by reducing the amount of light that reaches the eyes. If someone is still getting blinded because the sunglasses are too bright, it may be a sign that the sunglasses are not providing adequate protection. In this case, it may be necessary to choose sunglasses with a darker tint or a higher level of UV protection to effectively reduce the brightness and protect the eyes. It's important to ensure that sunglasses are properly rated for UV protection and provide the appropriate level of tint for the intended use. **

The Greeks may wear sunglasses to protect their eyes from the strong Mediterranean sun, which can be quite intense during the summer months. Additionally, wearing sunglasses can help reduce glare and improve visibility, especially near the water. On the other hand, tourists may not be as accustomed to the bright sunlight and may not realize the importance of protecting their eyes, or they may simply be more focused on sightseeing and taking in the new surroundings. **

Yes, sunscreen is available in Africa and is commonly used by people to protect themselves from the sun. In addition to sunscreen, people in Africa also use a variety of other methods to protect themselves from the sun, such as wearing hats, sunglasses, and clothing that covers their skin. Some traditional methods of sun protection in Africa include using natural products like shea butter or coconut oil on the skin. **