I started my commonplace book to keep track of all the ideas and information I had collected during teacher certification. I now use a blog for the newer stuff. If you want to start at the beginning, go to my central hub for the various sites that I have created for my own personal use.
Please feel free to contact me with any ideas, comments, or questions, or if you just want to buy me a coffee. Sam Nov 22, Biology , History , Humor , Movies , Science My son Alton is interested in dinosaurs, so he is starting to collect various dinosaur toys. Leave a Reply. Keep it clean. Cancel reply. Here is my blog Welcome to my own private Idaho on the Interwebs. Theropods looked like they had digits 1, 2 and 3, while birds have digits 2, 3 and 4.
That mismatch failed to support the widely accepted evolutionary link between dinosaurs and birds. Now, newly described fossilized hands from a beaked, plant-eating dinosaur, called Limusaurus inextricabilis , reveal a transitional step in the evolution of modern wings from dino digits.
The finding could resolve a debate over which fingers ultimately became embedded in the wing. The remains of the dinosaur were discovered in the Junggar Basin of Xinjiang, in northwestern China.
The deposits date back some million years. He and several colleagues have described the theropod dinosaur in the June 18 issue of the journal Nature. Jack Conrad, vertebrate paleontologist at the American Museum of Natural History in New York, calls the finding a "spectacular discovery. The dinosaur was a ceratosaur, which is the group name for the earliest theropods.
The largest known ceratosaur, Ceratosaurus nasicornis , boasted a length of up to 25 feet 8 meters , and showed off a prominent nasal horn. Stretching no more than 5 feet 1. However, it was the dinosaur's hand that especially caught the attention of Clark and his colleagues.
It sheds light on a longstanding question over which fingers are present albeit in a modified form in the wings of living birds. The large surface area of your molars helps them grind up food. Tooth enamel is the hardest substance in the body. The shiny, white enamel that covers your teeth is even stronger than bone. This resilient surface is 96 percent mineral, the highest percentage of any tissue in your body — making it durable and damage-resistant.
The strongest muscle based on its weight is the masseter. With all muscles of the jaw working together it can close the teeth with a force as great as 55 pounds 25 kilograms on the incisors or pounds The muscles of the eye are your most active muscles, constantly moving to readjust the position of your eyes. Table of Contents. We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits.
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