If the noise is lower, the AC service may be the cause. Magnetic fields from transformers can cause humming. Mains transformers typically cause an AC magnetic field around them. This magnetic field can be copled to wiring, electronics or signal transformers and cause humming.
Baby oil benefits: ear. Mineral or baby oil is good from treating common ear problems, such as wax build-up. For those that are hard of hearing, we recommend using a few drops of heated baby oil before going to your ear specialist. Then pour the drops in your ear, keeping your head cocked. Hold for a few minutes.
Attention deficit-hyperactivity disorder (ADHD). Taking evening primrose oil by mouth does not improve ADHD symptoms in children. However, taking a specific supplement containing fish oil and evening primrose oil ( Eye q, Novasel) daily does seem to improve symptoms in children 7-12 years-old. The fish oil might be the beneficial part of the supplement.