Machine generated contents note: What Is Science? -- Introduction -- Why Are Trees Green? -- Trees and forests -- How Do We Know What Dinosaurs Looked Like? -- Dinosaurs and early humans -- What Do Plants Eat? -- Plants and flowers -- Why Do I Have to Wash? -- Skin and sweat -- Are Maps Always Right? -- How we see our world -- Why Does My Hair Grow? -- Hair, nails and blood -- Why Does Medicine Taste So Bad? -- Medicine and mould -- How Do Surgeons Know What To Take Out? -- Surgery and anatomy -- Why Is Bread Full Of Bubbles? -- Yeast and fermentation -- Why Do Stars Twinkle? -- Stars and planets -- How Was The Earth Made? -- The "Big Bang" and the Sun -- What's Inside A Black Hole? -- Space and the Universe -- Why Do Sirens Sound Weird When They Go Past? -- Sound and radio waves -- How Do Airplanes Stay Up? -- Flight and motion -- How Do We Know The World Is Round? -- Orbits and gravity -- Why Is the Sea Blue? -- The ocean and deep-sea exploration -- Where Do Mountains Come From? -- Plate tectonics and volcanoes -- What Makes Thunder And Lightning? -- Weather and electricity -- Could I Live On Mars? -- Space travel -- Is "The Cloud" A Real Cloud? -- Computers and robots -- Why Do I Dream? -- Sleep and the brain.