vendredi 22 avril 2011
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![]() Sun Dog Phenomenon Observed over Stockholm (1535)Today, the science behind parhelia—also known as "sun dogs"—is well understood, but when the huge, glowing halos and miniature suns appeared in the sky above Stockholm in 1535, it was a major event. A painting of the occurrence is the earliest color depiction of Stockholm, then a crowded cluster of stone buildings on an island. It is also the earliest depiction of sun dogs and is largely scientifically accurate. What were some of the conflicting interpretations of the omen at the time? More... Discuss |
![]() ![]() Spider WebsMany spiders use webs of proteinaceous fibers extruded from silk-spinning organs, called spinnerets, to catch prey without having to expend energy pursuing it. However, constructing a web is an energetically costly process, and it is not uncommon for a spider to eat its own web each day to recoup some of the energy expended in its spinning. A remarkable material, spider silk possesses a tensile strength comparable to that of high-grade steel and has been used in medical settings to do what? More... Discuss |
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