Throughout the 20th century the exploitation of the river Don and its tributaries continued. Thermal pollution raised the temperature of the rivers, and acids, tar, oil and highly toxic heavy metals ...

Leo XIII – February 20, 1878 - July 20, 1903: Born Vincenzo Gioacchino Raffaele Luigi Pecci in Italy, he directed the ...

In the 20th century, a vaccine for yellow fever was developed ... and cases still surface to the present time. The Panama Canal Soon after the discovery that mosquitoes transmit yellow fever ...

The following aspects of our lifestyle can lead to some forms of cancer, heart disease and mental health problems: By the end of the 20th century, it was also understood that some diseases ...