Amy Peckham-Driver was 14 when excruciating period pains caused her to pass out in a toilet.
「因為如果它看起來不像鴨子，那它可能就不是鴨子，」他解釋說，「因為它與長期證據、長期趨勢差距太大。」
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Leonardo da Vinci is usually credited with conducting the first systematic study of friction in the late 15th century, a subfield now known as tribology that deals with the dynamics of interacting surfaces in relative motion. Da Vinci's notebooks depict how he pulled rows of blocks using weights and pulleys, an approach that is still used in frictional studies today, as well as examining the friction produced in screw threads, wheels, and axles. The authors of this latest paper used an experimental setup similar to da Vinci's.