"I have good news and bad news," a defense attorney told his client.
"First the bad news: The blood test came back, and your DNA is an exact match with the sample found on the victim's dress."
"Oh, no - I'm ruined!" cried the client. "What's the good news?"
"Your cholesterol is down to 140!"
Oldest fossilsIn 1977, American paleontologist Elso S. Barghoorn of Harvard announced the discovery of Pre-Cambian spherical one-celled algae microfossils (named Eobacterium) 3.4 billion years old, earth's earliest life forms. Barghoorn, with J. William Schopf, studied the ancient chert (a flintlike or quartz-like rock) of the Fig Tree formation in Transvaal, South Africa. Rubidium and strontium ratios in the chert are used to establish the age of the rock, and the fossils contained in it. The fossils are a kind of Prokaryotes, organisms with simple cell wall containing organic chemicals, and examples of cell division are visibile in the remains. A huge number of varieties exist today. They all produce oxygen; and, in the Precambrian period, began to change the earth's primoidal reducing atmosphere to the oxygenated one we have today. |
