Human blood vessels can circle Earth twice., Fact ✓ – The total length of arteries, veins, and capillaries in one body is about 100,000 km, which is more than twice the Earth's circumference., People are either “left-brained” or “right-brained”., Myth ✘ – Brain scans show that both hemispheres work together in almost all complex tasks such as thinking, creating, and solving problems., Placebos can trigger real improvements in health., Fact ✓ – The placebo effect can cause real biological changes, such as the release of endorphins, because people expect to feel better., Yawning is only a sign of tiredness., Myth ✘ – Yawning may help cool the brain, maintain alertness, and it can also be socially contagious., Swearing increases pain tolerance., Fact ✓ – Swearing can activate emotional brain centres and trigger a stress-related pain-relief response, helping people tolerate pain longer..

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