This could mea Written By: Annie Lennon. FEB 09, Many ocean species use sound to communicate and survive. Sound is a crucial communication method since vision is limited Written By: Tiffany Dazet.
MAR 09, Many issues plague the iconic orcas of the Pacific Northwest United States, including declining salmon populations. APR 01, Until now, astronomers had detected X-rays from every planet in our solar system apart from the two Ice Giants: Uranus a JUN 17, JUL 15, Just like humans, rats tend to help members of their own social group before strangers.
The findings may help researcher Tagging is how all of our articles, products and events are related to each other. The human body can take a remarkable amount of punishment, given bones made of one of the strongest materials found in nature. At the same time, even an unarmed person can inflict an astonishing amount of damage with the proper training.
So how much does it take to crack a bone? And how much mayhem can a person deal out? In an era when "extreme fighting" has become a popular phenomenon, scientists are testing the extremes that athletes at the peak of their game can reach in order to help the rest of us.
Bone is extraordinarily strong — ounce for ounce, bone is stronger than steel, since a bar of steel of comparable size would weigh four or five times as much.
A cubic inch of bone can in principle bear a load of 19, lbs. However, forces coming from the side — or shear forces — are trouble for any kind of lengthy bone.
The twig metaphor is again handy, if disturbing: Imagine breaking a bundle of twigs in half. In addition to all this, bones vary in thickness and toughness from person to person, depending on age, diet and lifestyle. It's true that calcium helps build strong bones.
Alas, it's also true that bone density peaks around age It's all downhill from there. Amy has more details in her report, including a bonus dose of information on space science, provided entirely free of charge.
0コメント