It is proposed that the Li abundances in F-type stars can be affected by the weak mixing generated by internal gravity waves since the absence of Li is so strong among this spectral type. The mixing mechanism caused by the waves is describe theoretically and is applied to the F-stars because of the inherent similarity of the Li gap. The wave-energy

Radio, infrared, and optical observations of the embedded infrared cluster IRAS17136 - 3617 are reviewed. The cluster consists of more than 25 stars with a total stellar mass of 100-400 solar masses embedded deep into a dense molecular cloud of mass 4 x 10,000 solar masses. An extended H II region is found to be expanding outward of the molecular

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