Our forebears abandoned their easier foraging habits, traveling longer distances through a tropical landscape to acquire sufficient food to survive. Adding meat to their diets meant more calories, but finding prey also took more work. Their activity level increased and with it their need to dissipate body heat to avoid tissue damage. By 1.6 mya, protohumans had long legs for sustained walking and running. Along with that trait came naked skin and a large number of eccrine sweat glands, which produce moisture that removes body heat through evaporative cooling. The hairs on our head also help to combat overheating, by shielding our big brain from direct sun.
For example, the shell's outermost layer consists of strong particles of iron sulphide created in the hydrothermal vents, each around 20 nanometres across, embedded in a soft organic matrix secreted by the snail. This structure is designed to crack when hit, but in a way that absorbs energy.
Cracks spread only by fanning out around the iron sulphide particles. This "microcracking" not only absorbs energy, it also ensures that larger cracks do not form. What's more, the particles of iron sulphide may blunt and deform intruding claws, the study suggests.
First, a magnetic climber that has compliant magnetic wheels and is capable to climb on ferromagnetic surfaces. This robot can be used for inspection of ship hull or bridges. Second, is a Snail inspired wall climbing robot capable of climbing on non metallic surfaces using hot melt glue. The robot secretes the adhesive at the front and peels off the track from the wall at the bottom leaving a trail behind just like the snail does. Third, is a robot that uses sticky wheels in order to attach itself to the wall. It simply has 3Ms sticky tape on the wheels. It can climb on smooth surfaces like glass. Fourth, is a four legged wall climbing robot for climbing on rough surfaces. It has 12 claws made of fishing hooks mounted on each footpad, and it climbs like cat or other rodents.
Its Zero Emission Electric Propulsion Ship will use batteries that can be recharged at charging stations in ports it visits. The plug-in ship powered by lithium-ion batteries would run without a diesel engine, thus cutting its carbon dioxide or nitrogen oxide emissions to zero.
His installation for The Curve will take the form of a walk-though aviary for a flock of zebra finches, furnished with electric guitars and other instruments and objects. As the birds go about their routine activities, perching on or feeding from the various pieces of equipment, they create a captivating, live soundscape.
The seller is California businessman Paul Kaufmann, who first became aware that his family possessed the item in 1990. While searching among his late mother's possessions, he happened on an ancient, pear-shaped box labeled "Beethoven."
Years of investigation by historians and scientists make a compelling case that the box was labeled accurately. Exhibit A: Kaufmann's great-great uncle was a physician closely involved in the 1863 exhumation of Beethoven (and Franz Schubert) largely for scientific study; according to several accounts, the physician kept Beethoven's skull. Exhibit B: Tests of existing strands of the composer's hair point to a DNA match. For Exhibits C through Z, see Dickey's book.
In order to keep from shriveling like your fingers in the bathtub, fish must constantly exchange ions, such as sodium and potassium, with the water. Larval fish can exchange ions through their skin, and early fish likely used rudimentary gill structures known as branchial baskets. But when the salinity of the water changes rapidly--as happened when fish invaded freshwater habitats--fish would have needed a much more efficient way of exchanging ions with their environment. That means large, complex gills.
The pigs were fed on a diet of acorns and roots to give the ham a distinctive flavour.
After being slaughtered their ham was salted and cured for three years, before going on sale in a hand-made wooden box wrapped in an apron made by a Spanish tailor.
