George Washington died after his physician treated his sore throat with bloodletting, but don't let that stop you from ...

World over, more people die in the winter than any other season. Scientists have investigated why for decades. They have some ...

That means that the vans are very busy indeed, all the time. So it's a good job we've got the circulatory system to transport nutrients, water and oxygen to the entire body. Your circulatory ...

Veins between two capillary networks are portal systems. Closed circulatory system, but fluid constituents of blood leak out of capillaries and return to the heart by the second component of the ...

This article was originally published with the title “ The Circulatory System of Plants ” in Scientific American Magazine Vol. 200 No. 2 (February 1959), p. 44 doi:10.1038 ...