Scientists are creating vaccinations that prevent people from getting bird flu. If the virus mutates, a new vaccine needs to be made. The vaccine needs to be tested, which can be dangerous. It also takes a long time for scientists to know whether the vaccine works.
<span>pressure , heat and erosion
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Yes it does but is dangerous
Don't sell VHS tapes for 0.25$ Because they are valuables and are worth hundreds ... If I was you I would just keep those for yourself and them sell them online ... There worth alot
