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It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.

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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.

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Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.

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The calories found in one piece of cherry cheesecake could light a 60-watt light bulb for 1.5 hours.

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Green tea is able to stop the scent of garlic or onion from causing bad breath.

The gill-withdrawal reflex in the sea slug. The gill-withdrawal reflex in the sea slug.
coagulase negative Staphylococcus on Blood agar coagulase negative Staphylococcus on Blood agar
Gram negative flowchart Gram negative flowchart
Nonverbal communications convey strong, powerful messages that may be negative or positive. Nonverbal communications convey strong, powerful messages that may be negative or positive.
Gram negative N. gonorrhoeae. Gram negative N. gonorrhoeae.
Negative Feedback and Temperature Control Negative Feedback and Temperature Control
Video: A timeline of the teeth (Explained - No Audio)

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