Dan Mandell is a research fellow in genetics at Harvard Medical School in Boston, Massachusetts.
				Segment
						
	
	
	
	
			
	
					
				 
		
					
		
		
	
    
		Read More    
			
12:05
Scientists Engineer Bacteria With Genetic ‘Kill Switch’
Genetic engineers have designed strains of E. coli that can survive only in the presence of a compound that doesn’t exist in nature.