During a period of about 150 years, the discoveries of pea experimenter Mendel led to a completely deciphered genetic code, gene shears made it possible to rewrite our genome and the first designer babies were born in China. Since then, the science has passed some unbelievable milestones and now has a new tool: CRISPR - scissors combined with a navigation device that make it possible to modify the genome of plants, animals and humans. Great inventions looks through the microscope.