Program: GS-2006A-C-5

In our continuing work on $^{6}$Li and $^{7}$Li isotopic abundances in Galactic halo stars, we have boosted the number of positive $^{6}$Li detections in such stars from the previous single case to at least ten. No doubt the most exciting result stemming from our program is a detection of $^{6}$Li in LP815-43, one of the most metal-poor stars in our sample ([Fe/H]=-2.7). If high $^{6}$Li abundances at low [Fe/H] is a general feature, it would have important ramifications for light element production in the early Universe, Li depletion in metal-poor stars, Big Bang nucleosynthesis and possibly even non-standard particle physics. We here request Gemini-S/bHROS time to observe a sufficiently large sample of very metal-poor stars to test whether such a $^{6}$Li plateau indeed exists.