"The CV and the CK chondrites are so similar that they've been describes as a clan"-Tasha Dunn

https://www.youtube.com/watch?v=UHtlCWAi4EI

This LPI is about tracking certain small meteorites back to a parent body. For example more than half of all asteroids are fragments of Vesta. Other asteroids must be fragments of something else right? It's actually common, one vestoid may have been broken into smaller pieces for example. 

The way you find out is either backtrack the orbits and see if they merge, but that only works for something recent and flying in a noticeable cluster. Or you collect a bunch of meteorites and see that some of them are similar, and guess that they may have come from a common parent body. That's what this LPI is about. 

• Our speaker is an undergrad teacher, and as such she builds her argument from a more fundamental level than a professor free of a class schedule would. That's great for us, she spends the first half of the lecture explaining everything one needs to understand the second half of the lecture using beautiful and intuitive slides. I think they speak for themselves and need no highlighting from me.
• The meat of the lecture starts around 12:20. This is where she starts transferring away from background.
• Slide at 17:55 is when she starts the question of if CV's and CK's came from the same parent asteroid. 
• At 20:20 she demonstrates the dilemma. One parent body or two, either has redox problems.
• At 23:55 she shows a sample that may be a transitional phase between the two and therefore support the one-parent-body path. Most of the remaining lecture is interrogating this premise.
• At 44:15 the argument is complicated. 
• Conclusions at 45:05.

I find the Late Heavy Bombardment, and any kind of early bombardment fascinating. So many things seem to hinge upon it. So many asteroids, trojans, and the like seem to be fragments of it. I wonder how many Mars-sized objects there really were, or if there were more Vestas. Taking meteorites from the ground and getting a thin-slice is the primary tool we have to look into such things, so it's no surprise that progress is slow. Maybe one day we will know the origins of each large asteroid though.