see some of the internal structures of a single metal counterion so now we're talking about this regime of resolution so so far I've demonstrated the scalability of photoacoustic tomography has applications in animals cells all the way to humans but we're also working on time reversal because eventually wanna beat the penetration limit the photo acoustic tomography go even beyond what's available right now so time reversal is possibly one solution this is a very very interesting concept you know the we are actually