Home > Mental health > Brain > Fascinating phenomena 12 May 2019 WATCH: What if our brains were half the size? What if our brains were 50% smaller? 0 Related WATCH: How would human brain transplants change the world? WATCH: What if we used 100% of our brains? FEATURE DOCUMENTARY: What makes a genius? Ask CyberShrink » Talk Heart to heart forum » How brain injury affects you Transparent brains The human brain is packed with 100 billion neurons. It's responsible for everything we do, think and feel. It dictates our emotions, intelligence and overall mental health. But, what if our brains were 50% smaller?Image credit: iStock NEXT ON HEALTH24X Could psychotherapy work for you? 2019-11-19 07:07 More: BrainFascinating phenomena advertisement Other news Diet and nutrition Can cinnamon help you lose weight? Medical Can more exercise improve thinking skills in cancer survivors? Diet and nutrition Pumpkins are the new superfood Medical What impact does getting less than 7 hours of sleep have on your body? Fitness Bringing up the rear: a workout for your glutes Medical A 73-year-old woman’s ‘velvety palms’ were actually a rare sign of lung cancer Live healthier Lifestyle » E-cigarettes: Here are five things to know E-cigarettes have become hugely popular in the past decade, but a rash of vaping-linked deaths and illnesses in the US is feeding caution about a product that's already banned in some places. Allergy » Ditch the itch: Researchers find new drug to fight hives A new drug works by targeting an immune system antibody called immunoglobulin E, which is responsible for the allergic reaction that causes hives.