Background The human lens is continuously exposed to high levels of light. Ultraviolet radiation is believed to play a causative role in the development of cataract. In vivo, however, the lens is ...

Eventually, the light-sensitive spot evolved into a retina, the layer of cells and pigment at the back of the human eye. Over time a lens formed at the front of the eye. It could have arisen as a ...

LN: The lens is extremely tiny ... The chickens came from the University of Uppsala and the human embryos came from women's clinics in Stockholm and in Göteborg and so on. And from Germany ...

I expect Aiden and Michel would argue that the books Google has scanned are all they have to work with, but given what’s missing, their “lens on human culture” theory may be too bold a claim.­ About ...

Human Geography 93(4): 1-12 ... Seeing (and doing) conservation through cultural lenses. Environmental Management 45(5): 5-18. Pugh, J., D. Thien, and N. Marres. 2009. The spaces of democracy and the ...