It's not limited to one input, either. The MIT team found that they could produce multiple RNA strands in response to specific conditions, such as the presence of a certain medicine.

You probably won't see this approach used in humans any time soon. Sorry, your medical history won't be written in your genes. However, it could be extremely helpful for studies. Scientists could better track the development of an animal from embryo to adulthood, and understand the advancement of cancer or infections. Think of this more as a stepping stone for other discoveries than anything else.