The folks over at TedEd have posted an excellent video exploring the relationship between stress and memory.
The video lasts only a few minutes, but it includes lots of helpful information.
In particular, note that we can’t simply say “stress harms memory.” We always have to be more specific:
How much stress?
What kind of memory?
When does the stress take place?
What do we want our students to remember?
All these variables matter.