How does a fitness tracker know how many steps you've walked? Why does a cruise ship float on water? What technologies are changing our cities? This comprehensive guide explains how everyday objects work, from a huge space rocket to a whiteboard. Cutting-edge photography and comprehensive explanations make this a fantastic opportunity to learn science in a new way. Based on the very latest research, this is the definitive children's guide to understanding the world around us. For children aged 8+.