Series means connecting a negative terminal of one battery to the positive terminal of another battery to increase the Voltage. A Parallel connection on the other hand, means connecting like (Positive to Positive and Negative to Negative) terminals of batteries together.eries means connecting a negative terminal of one battery to the positive terminal of another battery to increase the Voltage. A Parallel connection on the other hand, means connecting like (Positive to Positive and Negative to Negative) terminals of batteries together.
photograph from the Smithsonian Photo library, copyright 1993, Smithsonian Institution, used with permission. Saber-toothed cats are some of the best known and most popular of all Ice Age animals. They are among the most impressive carnivores ever to have lived.Two different types of saber-toothed cats lived in the midwestern U.S. at the end of the last Ice Age. One type was the familiar sabertooth, represented by the genus Smilodon. These cats had enlarged canines usually associated with the name sabertooth.Their canines were up to 18 centimeters (7 inches) long.A mounted skeleton of Smilodon fatalis is shown in the above photograph.ne type was the familiar sabertooth, represented by the genus Smilodon. These cats had enlarged canines usually associated with the name sabertooth. Their canines were up to 18 centimeters (7 inches) long. A mounted skeleton of Smilodon fatalis is shown in the above photograph.
Archaeologists found a copper blade in Switzerland that's just like the ax Ãtzi the famous Icemanwas carrying when he died. Like Ãtzi's ax, this tool was made with copper that came from hundreds of miles away, in present-day Tuscany in central Italy. The discovery could shed light on Copper Age connections across Europe.