Here's some interesting research via DNA analysis and such - along with the typical bone and artifact finds - which makes for a great read on TAL. And, how does the Toba Volcanic Eruption of 74K years ago figure into it?
Ever wonder how far along NASA is to finding the asteroids that could destroy Earth or portions of it? Well about 35% of the way! And some of the ones yet to be found are up to 3,300 feet across. Yikes.
How about some time travel to 1909? A time when sending one's daughter into the streets to sell to strangers to help the family and themselves was considered normal. The info with this picture suggests that the smallest one in the photo has been selling papers for over 2 years already.
http://www.shorpy.com/files/images/SHORPY_05413u.jpg (full size)
http://www.shorpy.com/node/12458?size=_original (with comments)
You'll find classy links like these in the archive - dig into it for more.
Still have some books from the garage sale?