1. Engineers at Johns Hopkins University have developed SPECTRA, an optical instrument using nanoprobes that light up upon binding to aggressive cancer cells, aiding in distinguishing between local and metastatic tumors. 2. The technique combines DNA origami and Raman spectroscopy, making it scalable and more economical. 3. SPECTRA successfully identified metastatic prostate cancer cells, providing a clearer molecular signature than traditional CT or MRI scans.