1. Via Jocelyn Glei’s newsletter, a research article about the positive impact of sending thank you notes:

The senders of the thank-you letters consistently underestimated how positive the recipients felt about receiving the letters and how surprised they were by the content. The senders also overestimated how awkward the recipients felt; and they underestimated how warm, and especially how competent, the recipients perceived them to be.

2. Via just about everywhere, the National Geographic piece about “The Science of Sleep” is really interesting.