The myth that humans only use 10% of their brains is a long-standing one that has been debunked numerous times.
The human brain is estimated to contain around 100 billion neurons and is responsible for controlling and regulating nearly all of the body's functions.
The reality is that we use all of our brains, just not all at once - different areas of the brain are activated depending on what activities we are doing and how we are feeling.
Despite the debunking of the 10% myth, it continues to persist and has even been the basis of popular movies like Lucy.