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By combining diamond-anvil-cell and laser-driven shock wave techniques, we produced dense He samples up to 1:5 g=cm 3 at temperatures reaching 60 kK. Optical measurements of reflectivity and temperature show that electronic conduction in He at these conditions is temperature-activated (semiconducting). A fit to the data suggests that the mobility gap closes with increasing density, and that hot dense He becomes metallic above $1:9 g=cm 3 . These data provide a benchmark to test models thatdoi:10.1103/physrevlett.104.184503 pmid:20482179 fatcat:ihazq5c7rjd67h6pmlfa2mazqy