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Every two years , AIDS activists , researchers , funding agencies and aid groups get together for the International Conference on AIDS at which they discuss the pandemic and , usually , denounce governments for doing too little . " But just a few yards from the hustle and bustle of the aquarium sits Stanford 's renowned Hopkins Marine Station - - a secluded 11-acre campus usually restricted to university faculty , students and personnel . Methods : In many tropical ecosystems ( i.e ., Site 21 ) annual primary production may be high , but dietary protein is usually below maintenance level for much of the year and animal production is limited by diet quality rather than intake level . A batter usually lasts around 8 hours and charges to almost full capacity in an hour . But even so , the analysis performed is usually limited to simulation and syntactic checks , which are simple but provide little correctness guarantee , and theorem proving , which requires extensive human efforts .