biological evolution

Most organisms share the biosynthetic pathways for making crucial nutrients because it is is dangerous to tinker with them. But now a collaborative team of scientists has caught plants in the process of altering where and how cells make an essential amino acid.

In his talk, Murray Gell-Mann will look back to 1905 when Albert Einstein, an unknown scientist, published several papers, each with a revolutionary idea. He will examine Einstein’s creative thinking, how current cosmological discoveries relate to his work, and today’s efforts to find a unified theory of everything. Gell-Mann received the Nobel Prize in physics in 1969 for his discovery of the quark – the basic building block of all atomic nuclei throughout the universe.

Image courtesy USGSA team of geologists from China and the United States, including two from WUSTL, report evidence of at least three ice ages occurring between 750 and 600 million years ago.Glaciers reached Cape Cod, Massachusetts, in the most recent ice age about 20,000 years ago. But much harsher ice ages hit the Earth in an ancient geological interval known as “the Cryogenian Period” between 750 and 600 million years ago. A team of geologists from China and the United States, including two from Washington University in St. Louis, now report evidence of at least three ice ages during that ancient time.