 Wedges
        
                    
                by
            
        
        
            Joanne Mattern
                    
        
            Wedges
        
                    
                by
            
        
        
            Joanne Mattern
        
                    
        
                
                            
        
        
                    
                Call Number: J 621.8 MATTERN
            
        
                    
                ISBN: 9781626179950
            
        
                    
                Publication Date: 2019-08-01
            
        
                
                            
                Wedges were some of the first tools humans ever created! Today, these simple machines are found all around, from doorstops to our own front teeth. Diagrams and simple text explain how wedges work, while experiments allow readers test the machines for themselves. Move through the history of wedges, from hand axes to handsaws, in this fascinating title for beginning readers.