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In 1864, the first barbiturate (barbituric acid) was synthesized.

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Fewer than 10% of babies are born on their exact due dates, 50% are born within 1 week of the due date, and 90% are born within 2 weeks of the date.

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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.

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Interferon was scarce and expensive until 1980, when the interferon gene was inserted into bacteria using recombinant DNA technology, allowing for mass cultivation and purification from bacterial cultures.

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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.

The three basic body plans of bilaterally symmetrical animals. The three basic body plans of bilaterally symmetrical animals.
Overview of gas exchange between the environment, blood, and cells. Overview of gas exchange between the environment, blood, and cells.
A fossil leaf in low-grade coal A fossil leaf in low-grade coal
Providing structure and organization in the child’s environment may aid the development of ... Providing structure and organization in the child’s environment may aid the development of ...
An infant begins to notice the external environment by the age of 4 to 8 months An infant begins to notice the external environment by the age of 4 to 8 months
The effect of gene–environment interaction The effect of gene–environment interaction
Video: Male Reproductive System - Testosterone

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