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.
Lavender Oil is a great oil to use for children's minor cuts and scrapes because it is anti-bacterial, calming and is considered safe enough to use with children. It is the essential oil of choice used in AromaWeb's Boo Boo Juice recipe. I've only mentioned a few of the most common uses for Lavender Oil here.