Dinosaurs existed between 230 million years ago and 65 million years ago, but none of the known dinosaur species existed for this entire time period. Throughout the group's existence, individual dinosaur species were evolving and going extinct. Some species diverged and gave rise to other species, while others disappeared. A mass extinction event at the end of the Cretaceous period, million years ago, ended the reign of dinosaurs on Earth.

We know of no true dinosaur fossils found in the State because the sedimentary rocks in West Virginia are too old (Paleozoic in age). Dinosaurs existed during the Mesozoic Era, but there are no known sedimentary rocks of Mesozoic age and no known rocks derived from Mesozoic rocks in the State. Any Mesozoic rocks that might have covered the State have been eroded away. Dinosaur tracks and some bones are found in Mesozoic rocks in Pennsylvania, Maryland, and Virginia. See similar questions...

Most people picture tipis when they think about Indian homes. Tipis have been around a long time; stone circles dating back several thousand years have been found at various sites on the Plains. Paleoindian peoples, living near the end of the ice age, did not appear to have used tipis. Traces have been found of posts which probably anchored tent frames or similar structures. Caves and rockshelters were also used as homes by various peoples in the past. See similar questions...

No. Not even close. The last dinosaurs to roam the earth, including the area that became Texas, became extinct about 66 million years ago. The earliest humans may not have arrived in this area of North America until shortly before 13,500 years ago (11,500 B.C.). Some scientists think humans probably arrived by 15,000 years ago or maybe even as much as 20,000 years ago. This still leaves quite a gap! See similar questions...

Prostate brachytherapy has been performed since the 1960s. Modern techniques were introduced in the early 1980s when Dr. Holm (in Denmark) developed the first transrectal ultrasound-guided transperineal prostate seed implants (TPPI). Physicians from the USA then learned this technique and began performing TPPI in the USA in the late 1980s. The procedure has undergone major technical innovations in the last five years. See similar questions...

The oldest known hominid, or humanlike species, has been dated at 4.4 million years old. Another species, which is yet to be confirmed as a hominid, has been dated at 6 million years old. Scientists estimate that the hominid lineage diverged from the ape lineage 5 to 8 million years ago. Homo sapiens, the species to which we belong, has existed for about 100,000 years. See similar questions...

The Act of the Virginia General Assembly establishing Kentucky County became effective on December 31, 1776; the county ceased to exist on November 1, 1780, when the county was divided into three separate counties: Lincoln County, Fayette County, and Jefferson County. See similar questions...

The oldest dinosaur types are known from rocks in Argentina and Brazil and are about 230 million years old in the Triassic Period. One of the earliest known primitive dinosaurs was Eoraptor ("dawn hunter") a fast-running, one-metre long carnivore. Because Eoraptor's skeleton shows some advanced skeletal features, older dinosaurs may yet be found. See similar questions...

The fact that dinosaurs became extinct might suggest they had some "Achilles heel" which led to their downfall. But it seems it was just bad luck and they weren't alone. At the end of the Cretaceous Period all the dinosaur families, together with the pterosaurs and marine reptiles, as well as about 75 percent of all other species on earth went extinct. See similar questions...

Dinosaurs probably communicated both vocally and visually. The chambered headcrests on some hadrosaurs and the large nose on Muttaburrasaurus might have been used to amplify grunts or bellows. The huge frill on the back of torosaurus' skull contains two large holes. These would have been covered with stretched skin creating vivid eye-spots when flushed with blood. Defensive posturing, courtship behaviour, and territory fights probably involved both vocal and visual displays. See similar questions...

No, dinosaurs first appeared about 100 million years after the time of Fossil Grove. No fossil animals have been found at Fossil Grove but evidence from elsewhere shows that the forests were rich in life. Fish swam in the rivers and pools, and there were amphibians and reptiles as well as insects, spiders and scorpions. See similar questions...

Scientific American, August 1998 (Vol 279, Number 2, article by N.L.Johnson, Page 43, (63 in US edition?!)) explains : quot;80 clumps of needles (were) released in May 1963 as part of a US Department of Defense telecommunication experiment. The radiation pressure exerted by sunlight (???) was to have pushed the tiny needles - all 400 million of them - out of orbit .. See similar questions...

This website exists because of Attention Deficit Disorder (ADD). They didn't call it ADD back then, but I was never able to pay attention in school. On the other hand flashcards worked well for me, so I used them extensively. When I encountered my first computer around 1970, I quickly realized it was the answer. By combining active learning (question drill) and adaptive learning (intelligent repetition), a computer could be much more effective than all those little pieces of paper. See similar questions...

Valid shots means that the Tetanus-Diphtheria was taken within the last 10 years from the current date, and the two MMR vaccines have been taken twice. The MMR vaccinations are good for life and do not have to be taken every 10 years as the Tetanus-Diphtheria. The more shots you’ve had, the better for you! Depending on when they were administered, they may count towards meeting the requirement. See similar questions...

A3: All APODs are archived. To see any past APOD, access the archive page. This is found by clicking "archive" on the link line, or even by clicking "Discover the Cosmos" near the top of recent APOD pages. See similar questions...

Our pastors returned to Sherwood from the Dallas area with a vision from the Lord to raise up a cell church from the harvest. The church began as a Friday night Bible study in 1991. As that group began to affect the lives of their families and those around them in their workplaces and neighborhoods, the need grew for the addition of a Sunday service. We now have a corporate service bi-weekly on Friday nights, with cell group meetings and other activities during the week. See similar questions...

The Ferrotti's time-sense is imprecise, so they don't really know. If the devilbunnies know, they aren't saying. See similar questions...

The North Buffalo Bison Hockey Association has history dating back to 1959 when it was the Shamrocks Athletic Club (A.C.) See the History section of our website for more background information. See similar questions...

It is rather impossible to find that out because time does not exist in the world of ghosts. Also - in most cases ghosts state that they are still alive and would therefore not be willing or able to answer that question. See similar questions...

Bubba the lobster is dead. There was a lot of controversy when this 22 pound lobster was fished out of the ocean. Some wanted him saved, others boiled. Finally, the restaurant owner donated him to an aquarium ? where he died the next day. Many will be showing up to mourn his passing. They'll come bearing candles, flowers, and melted butter. This is really awesome because at first, they weren't sure how he had somehow lost about 2,600 pounds of fuel. See similar questions...