The industrial pollutants known as PCB's were first manufactured in 1929 and were used as coolants for electrical equipment in Europe and North America the 1970s, when studies showed that the compounds had entered the food chain and were harmful to some animals.

Reptiles, by drawing their body heat directly from the Sun rather than burning calories to generate it, can survive on ten percent of the nourishment that a mammal of similar size would normally require.

In build-to-suit projects, developers design and construct to meet the needs of a primary tenant, who pays the developer a marginal fee for design and construction work and agrees to buy the completed building or will occupy all or most of it in exchange for a favorable long-term lease.

Even though interest rates rose last year, they were not nearly as high as the early 1980s, when the economy tumbled into a recession and markets were depressed.

In 1926, in her second attempt to swim across the English Channel, Gertrude Ederle not only crossed the Channel against currents that forced her to swim thirty-five miles instead of the minimal twenty-one, but she set a record for speed as well, by swimming the distance in almost two hours faster than anyone had yet done.

The rain has flooded drainage canals in many orange-tree groves, which has caused the fruit to fall before it will ripen and also threatened to kill the trees.

While recognizing that lying often facilitates social interactions, psychiatrists are seeking to determine when they become destructive and which kinds of mental problems they can signal.

In undisturbed primary forests, the Honduran mahogany grows up to a height of 130 feet, having a buttressed trunk and a crown that spread over the canopy of lesser trees.

In 1982, archaeologists recovered Henry VIII's ship Mary Rose, which, having sunk in 1545, with more than 17,000 artifacts on board, everything from arrows and longbows to a barber-surgeon's chest containing items commonly used by sixteenth-century medics.

The typical size difference between males and females has lessened since the origins of the human species because the size increase in males has been slight while the size increase in females has been great.