anxiety about/anxiety that
Nice explaination by our SC genius anandnk and Paul.
anxious about/anxious that
I think same explaination (above) should be applicable to this. Correct me if I am wrong
Interaction of/Interaction between
This is my personal opinion. I may be wrong. Perhaps others will confirm.
We must understand the interaction of light and matter.
We must understand the interaction of light with matter.
I know that previous interaction between
Peter was healthy.