Elizabeth can hold herself propped up in a more or less seated position now! We're not sure this really counts as sitting, because usually you don't need to prop yourself up with your arms when you are sitting... The first few times we tried this last week she could only stay upright for a few seconds (shades of Westley from the Princess Bride), but now she's good for several minutes. It's pretty fascinating to watch her getting stronger and more coordinated day by day.
Babies have some pretty intense focus. We often joke that if you could harness the energy of a toddler you would instantly solve the power crisis. Imagine what the world would be like if we all had the dogged determination of an infant?