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Author Question: Bell Telephone Laboratories invented the ________, which replaced the vacuum tube. (Read 256 times) |
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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The average office desk has 400 times more bacteria on it than a toilet.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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The most common childhood diseases include croup, chickenpox, ear infections, flu, pneumonia, ringworm, respiratory syncytial virus, scabies, head lice, and asthma.
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More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.