Currently, Thinklab pages do not preview well in search engine results. For example, see the top results for "thinklab science" on startpage:
I think the issue is that Thinklab pages don't define the description meta tag, which is an HTML attribute generally used by search engines for the preview snippet. Here's a good description of the meta description tag.
It seems like all pages besides perhaps discussions should get a meta description.
I've added a meta description to the homepage, which is probably important. Most of the others look fine to me. Do you have any particular concerns? Adding meta descriptions will become more important when we have better search rankings, and when we have a good copywriter.