Scientists from the Kunming Institute of Zoology, Chinese Academy of Sciences (KIZ, CAS) have discovered that a specific type of sound—at a frequency of 40 Hz—may help the brain "flush out" harmful proteins linked to Alzheimer's disease. How? By gently moving these proteins into brain fluid, where they can be naturally removed.

In their study, aged monkeys listened to this sound for just one hour a day over seven days. Remarkably, the benefits lasted for about five weeks after the sound stopped. This is the first time such long-lasting effects have been observed in animals with brains so similar to humans. Unlike some current Alzheimer's drugs, which can cause serious side effects, sound stimulation is non-invasive, safe, and low-cost. It offers a promising new hope for future treatments.