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Did you know?

A headache when you wake up in the morning is indicative of sinusitis. Other symptoms of sinusitis can include fever, weakness, tiredness, a cough that may be more severe at night, and a runny nose or nasal congestion.

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HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.

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Though methadone is often used to treat dependency on other opioids, the drug itself can be abused. Crushing or snorting methadone can achieve the opiate "rush" desired by addicts. Improper use such as these can lead to a dangerous dependency on methadone. This drug now accounts for nearly one-third of opioid-related deaths.

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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.

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Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).

Four types of covalent modifications that controls that activities of enzymes Four types of covalent modifications that controls that activities of enzymes
A schematic view of the mechanism of mRNA splicing A schematic view of the mechanism of mRNA splicing
Satellite View of Midlatitude Cyclone Satellite View of Midlatitude Cyclone
Example of the oligonucleotide probe design Example of the oligonucleotide probe design
Side view of a jumping spider making a leap Side view of a jumping spider making a leap
Video: Semidiscontinuous DNA replication

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