Science
Human Brain Quiz
86 billion neurons, 2% of body weight, 20% of your energy — 50 questions about the human brain.
86 billion neurons, 2% of body weight, 20% of your energy — 50 questions about the human brain.
The Human Brain Quiz is a free online quiz that tests your knowledge of the brain with 50 questions about neurons, memory, and brain science. Your brain contains approximately 86 billion neurons forming 100 trillion connections — yet weighs only about 3 pounds and uses just 20 watts of power.
Each round presents 10 randomized questions from a pool of 50, with four multiple-choice options and instant feedback after every answer. Your final score comes with a performance tier and shareable results.
You'll explore brain anatomy and regions, how neurons communicate through electrical and chemical signals, the mysteries of memory and learning, neuroplasticity and how the brain rewires itself, common brain myths debunked, neurotransmitters and their roles, and famous cases that shaped our understanding of the mind.
No, the "10% brain" claim is a myth. Brain imaging studies show that virtually all areas of the brain are active at various times throughout the day. Even during sleep, many brain regions remain active.
The human brain contains approximately 86 billion neurons. These neurons form roughly 100 trillion synaptic connections, creating the most complex network known in the universe.
The brain is not fully developed until around age 25. The prefrontal cortex, responsible for decision-making, impulse control, and long-term planning, is the last region to mature.
Last updated: March 2026