What colour is octopus’s blood and how heavy is the sky? The kids’ quiz

<p>Five multiple-choice questions – set by children – to test your knowledge, and a chance to submit your own junior brainteasers for future quizzes</p><ul><li><p><a href="https://www.theguardian.com/lifeandstyle/2021/sep/25/does-your-child-have-a-question-for-our-ne