The FDA has defended its decision to issue a refusal-to-file (RTF) letter for Moderna's new mRNA-based influenza vaccine, claiming the company had not used an appropriate control group in its pivotal ...

In a major shift in its hardware strategy, OpenAI launched GPT-5.3-Codex-Spark, its first production AI model deployed on ...

Investopedia contributors come from a range of backgrounds, and over 25 years there have been thousands of expert writers and editors who have contributed. Thomas J. Brock is a CFA and CPA with more ...

Eustress, or positive stress, can motivate individuals, aid in achieving goals, and contribute to overall well-being and a sense of fulfillment. Unlike distress, which arises from negative experiences ...

Christina Majaski writes and edits finance, credit cards, and travel content. She has 14+ years of experience with print and digital publications. Robert Kelly is managing director of XTS Energy LLC, ...