Have you ever wondered what a virus is? Want to know what an R0 number is? This Very Short Introduction for Curious Young Minds will tell you everything you need to know. This book… uncovers the invisible world of germs and reveals the facts about some of the world's tiniest living things, gives you the facts, figures, and words you need to speak like a scientist, will inspire you with photographs, illustrations, comic strips, and stories of the real heroes in the world of germs.