Vishal says humans use only 10% of their brain, and if the remaining 90% could be "woken up" too…

Why

Vishal's claim is one of the most widely repeated 'facts' about the brain, which is exactly why it feels true — repetition, not evidence, is what has kept it alive. Brain-scanning studies looking at people doing all kinds of tasks — thinking, moving, resting, even sleeping — show activity spread across virtually the entire brain, not just a small fraction lighting up while the rest stays dark. There is also a strong reason this could never make evolutionary sense: the brain uses about 20% of the body's total energy despite being only about 2% of its weight — an organ that expensive to run would never have evolved to leave 90% of itself unused. Test it: think about brain injuries — damage to almost any area of the brain causes some kind of noticeable problem (movement, speech, memory, vision), which would be strange if 90% of the brain were doing nothing important in the first place. His sister is right: humans use nearly the whole brain, not just 10% of it — a claim repeated everywhere is not the same as a claim that has actually been tested and confirmed.