Roundup:

• /u/restricteddata on "How come so many prominent physicists fled Nazi Germany but so many rocket engineers and doctors stayed until the end of the war?"
• /u/MannyStillwagon on "Did any ancient civilization realize how vast the distances between stars were?"
• /u/riskbreaker2987 on "Hagarism in Islamic Studies - How did the debate about this go down exactly, and what eventually killed it off?"

In the interest of preserving reddit's Americo-centrism:

Happy Mother's Day to all the historian moms out there! May you and your children be as collectively awesome as Mary Wollestonecraft and Mary Shelley. :)

Since this is the Sunday Digest and not Friday FFA, here is my HOLY SHIT FIRST EVER^1 AskHistorians post, on "What would make a mom proud of her child in the Middle Ages?"

^1 Um...first non-deleted

This one about slag heaps was unexpected and thought-provoking, but under-loved here. So I was really happy to see it get more attention when it was x-posted to our sister sub /r/AskAnthropology

• As far as artifacts go, how significant is slag?

• the /r/AskAnthropology version As far as artifacts go, how significant is slag?