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New guidelines for the diagnostic evaluation of people suspected of having cognitive impairment due to Alzheimer’s disease or related disorders is the first update since 2001 for specialists and the only guideline ever for primary care clinicians.

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Robin Sullivan | Robin Sullivan

Published January 24, 2024

Space FAQs

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Where does space begin?
While there isn't a single, universally agreed-upon boundary, the Kármán line, located 100 kilometers (62 miles) above sea level, is a widely accepted definition for the start of outer space.
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How did the universe begin?
The prevailing scientific theory is the Big Bang theory, which posits that the universe originated from an extremely hot, dense state and has been expanding and cooling ever since.
What is the universe made of?
The universe is composed of matter, antimatter, dark matter, and dark energy. While we can observe and understand ordinary matter, dark matter and dark energy make up the majority of the universe's composition, but their nature is still not fully understood.

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