The biotech still hasn't lost momentum. Vaccine maker Novavax (NVAX -9.65%) isn't dead in the water after all. Though the past 18 months have been tough -- and management warned investors that the business might sink soon -- Novavax reported positive developments in its latest quarterly update that doubled its share price in just one day. The biotech has come a long way since its not-so-successful attempt at dominating the coronavirus vaccine market. But do more recent developments make Novavax's stock a bu ...