Big Tech's big IPOs

Some of the biggest names in tech are making moves to go public this week. SpaceX — Elon Musk’s rocket, social media, and AI company — filed for an initial public offering yesterday. And the Wall Street Journal reported that OpenAI, the maker of ChatGPT, could file for an IPO as soon as tomorrow. These companies have raised a lot of private capital over the years. Why go public now? Plus, the pharmaceutical industry is investing billions in finding exotic radioactive isotopes to treat cancers.