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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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There are more nerve cells in one human brain than there are stars in the Milky Way.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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A good example of polar molecules can be understood when trying to make a cake. If water and oil are required, they will not mix together. If you put them into a measuring cup, the oil will rise to the top while the water remains on the bottom.
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Thyroid conditions may make getting pregnant impossible.