There are many ways to find a promising topic for a history-informed STEM lesson. Start by identifying your primary educational objectives. Scan the TEKS or other standards for specific recommendations. Searching textbook indexes for names will also usually turn up some important scientists and mathematicians from history.
The topic gallery below is here to help you think a little more broadly about possible topics. You can browse this gallery in a variety of ways. Under themes, you can start with a person or key concept. Or, browse by era, geography, or school subject.
This gallery is certainly not exhaustive, but it includes some particularly promising topics that have high-quality resources available. Some topics include a few suggestions for sources to help you get started. When you're ready to dig deeper, head to the Research a Topic page.