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Allergies are caused by the immune system's overreaction to harmless substances known as allergens. This response involves the production of antibodies, primarily Immunoglobulin E (IgE), which leads to various allergy symptoms.

Upgrading your phone every year is generally unnecessary unless you require the latest features or your current device is malfunctioning. Consider factors like cost, technological advancements, and personal needs before deciding.

Improving your Wi-Fi signal at home can be achieved by strategically placing your router, minimizing interference, updating firmware, and considering additional hardware like Wi-Fi extenders or mesh systems. These steps can enhance connectivity and ensure a more stable internet experience.

Protect your online privacy by using strong, unique passwords, enabling two-factor authentication, using a VPN, and being cautious about the information you share on social media. Regularly update your software to patch security vulnerabilities.

The sky appears blue due to Rayleigh scattering, where shorter blue wavelengths of sunlight are scattered in all directions by the gases and particles in Earth's atmosphere. This scattering causes the direct sunlight to appear white and the scattered light to color the sky blue.