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On April 5, President and Mrs. Bush visited Ella Du Plessis High School in Windhoek, Namibia. President and Mrs. Bush are visiting Botswana and Namibia as part of their continued commitment to the people of Africa through the work of the Bush Institute's global leadership program. Photo by Paul Morse for the George W. Bush Presidential Center.
Moored just outside the main dock at Glasson, the LIS WEBER was being refuelled on 17/6/95 before leaving the port.
During the process of making an orb web, the spider will use its own body for measurements.
Many webs span gaps between objects which the spider could not cross by crawling. This is done by first producing a fine adhesive thread to drift on a faint breeze across a gap. When it sticks to a surface at the far end, the spider feels the change in the vibration. The spider reels in and tightens the first strand, then carefully walks along it and strengthens it with a second thread. This process is repeated until the thread is strong enough to support the rest of the web.
After strengthening the first thread, the spider continues to make a Y-shaped netting. The first three radials of the web are now constructed. More radials are added, making sure that the distance between each radial and the next is small enough to cross. This means that the number of radials in a web directly depends on the size of the spider plus the size of the web. It is common for a web to be about 20 times the size of the spider building it.
After the radials are complete, the spider fortifies the center of the web with about five circular threads. It makes a spiral of non-sticky, widely spaced threads to enable it to move easily around its own web during construction, working from the inside, outward. Then, beginning from the outside and moving inward, the spider methodically replaces this spiral with a more closely spaced one made of adhesive threads. It uses the initial radiating lines as well as the non-sticky spirals as guide lines. The spaces between each spiral and the next are directly proportional to the distance from the tip of its back legs to its spinners. This is one way the spider uses its own body as a measuring/spacing device. While the sticky spirals are formed, the non-adhesive spirals are removed as there is no need for them any more.
After the spider has completed its web, it chews off the initial three center spiral threads then sits and waits. If the web is broken without any structural damage during the construction, the spider does not make any initial attempts to rectify the problem.
The spider, after spinning its web, then waits on or near the web for a prey animal to become trapped. The spider senses the impact and struggle of a prey animal by vibrations transmitted through the web. A spider positioned in the middle of the web makes for a highly visible prey for birds and other predators, even without web decorations; many day-hunting orb-web spinners reduce this risk by hiding at the edge of the web with one foot on a signal line from the hub or by appearing to be inedible or unappetizing.
Spiders do not usually adhere to their own webs, because they are able to spin both sticky and non-sticky types of silk, and are careful to travel across only non-sticky portions of the web. However, they are not immune to their own glue. Some of the strands of the web are sticky, and others are not. For example, if a spider has chosen to wait along the outer edges of its web, it may spin a non-sticky prey or signal line to the web hub to monitor web movement.
Announcement for Sunday morning and web. It is not intended to be super informative, but more of a reminder. I am probably going to try and make an HTML email reminder too.
Home alone this week. Going to treat myself to some Ribeye steaks from the butcher.
This was last night. Tossing another one on tonight!
I'm not kidding, there are webs everywhere...I almost think I need to wear armor to go out in the garden...to protect myself from those biting brats.
Préparation de ma prochaine présentation "Rédiger pour le Web" pour la SNCF, avec l'agence A Conseil et 90 C.
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This photo is posted for design inspiration. The design content and photos posted in this album are not my own, but posts from external sources around the web. For use in commercial and personal projects contact the original source of the content posted in the Album "Web Graphic Design Resources".
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