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Phenylketonuria is a condition where the body cannot process phenylalanine, an essential amino acid found in dietary proteins. Because phenylalanine isn't converted into tyrosine, excess amounts build up in the bloodstream while tyrosine levels drop, making tyrosine an essential daily supplement. This buildup causes high blood concentrations of phenylalanine to overload th blood-brain barrier transporter, effectively starving the brain of another vital amino acid - tryptophan.
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**Context (From Reddit): ** Unlike amphibians, amniotes (reptiles, birds, and mammals) have an amniotic membrane in their eggs and water-impermeable skin, meaning that they don't need bodies of water in order to reproduce and therefore can live their lives on land as true terrestrial animals.
Context: The pitch (bitumen) drop experiment is the world's longest running experiment. Started in 1927 by Thomas Parnell of the University of Queensland in Brisbane, Australia. In 2014 the 9th drop fell, with the 10th still in process. This experiment has allowed them to calculate the bitumen to have a viscosity of approximately 230 billion times that of water
