about some some of the newer technologies we've been working on time reversal and compressed ultra-fast photography the very first question is why do we bother with light for imaging purposes you know when you walk to a hospital you go to your video department you'll see a lot of imaging modalities already MRI ultrasound and x-ray what not now first of all it's very safe to use light because we're receiving light or optical photons all the time every day so we're dealing with what's called now ionizing radiation the radiation