Have you ever noticed that when you have a bowl of nuts, the bigger ones make their way to the top? This event actually has a scientific name: the Brazil Nut Effect. The term refers to the phenomenon in which the largest particles end up on the surface when a granular material containing a mixture of objects of different sizes is shaken.

Have you ever noticed that when you have a bowl of nuts, the bigger ones make their way to the top? This event actually has a scientific name: the Brazil Nut Effect. The term refers to the phenomenon in which the largest particles end up on the surface when a granular material containing a mixture of objects of different sizes is shaken.

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The rabbit test was an early pregnancy test developed in 1927 by Bernhard Zondek and Selmar Aschheim. The test consisted of injecting the tested woman’s urine into a female rabbit, then examining the rabbit’s ovaries a few days later, which would change in response to a hormone only secreted by pregnant women. Modern pregnancy tests use the same principle but no longer require an animal to discover the presence of the pregnancy hormone.

The rabbit test was an early pregnancy test developed in 1927 by Bernhard Zondek and Selmar Aschheim. The test consisted of injecting the tested woman’s urine into a female rabbit, then examining the rabbit’s ovaries a few days later, which would change in response to a hormone only secreted by pregnant women. Modern pregnancy tests use the same principle but no longer require an animal to discover the presence of the pregnancy hormone.

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