To embed an activity grid from PublicLab.org on another site, use this HTML code (but replace the word spectrometry
with the tag you'd like):
<iframe src="http://publiclab.org/embed/grid/spectrometry?t=activities:" style="border:0"></iframe>
It will appear like this, but within whatever page you place it in:

Q&A
For a Questions feature, you can use this:
<iframe src="http://publiclab.org/embed/grid/infragram?t=questions:" style="border:0"></iframe>
Maps
To embed a map of notes from PublicLab.org, use:
<iframe src="http://publiclab.org/embed/grid/0?t=map:content:40.7:-73.9" style="border:0"></iframe>