Each human body is made of roughly 40 trillion cells. For bacteria and viruses, it is a giant planet to live in, full of nutrients and warmth. But the immune system is a guardian, fighting the constant danger of invasion. Kurzgesagt explains how it works with this entertaining animation.
The Day is an independent, online, subscription-based news publication for schools, focussing on the big global issues beneath the headlines. Our dedicated newsroom writes news, features, polls, quizzes, translations… activities to bring the wider world into the classroom. Through the news we help children and teachers develop the thinking, speaking and writing skills to build a better world. Our stories are a proven cross-curricular resource published at five different reading levels for ages 5 to 19. The Day has a loyal and growing membership in over 70 countries and its effectiveness is supported by case studies and teacher endorsements.