What is a spider program and what areas is it used in?

In the early days of the Internet, there were relatively few of them, and it was easier to find information. However, with the development of the Internet, ordinary Internet users want to find the information they need is like looking for a needle in a haystack, and then professional search to meet the needs of the public information retrieval has come into being.

The ancestor of search engines in the modern sense is Archie, invented in 1990 by Alan Emtage, a student at the University of Montreal. Although World Wide Web had not yet existed at that time, the transmission of Chinese files over the network was still quite frequent, and because a large number of files were scattered in various scattered FTP hosts, it was very inconvenient to query, so Alan Emtage thought of developing a system that could find files by file name, so Archie was born.

Archie works very close to today's search engines, relying on scripts to automatically search for files on the web, and then index the relevant information for users to query with certain expressions. Inspired by Archie's popularity, the University of Nevada's System Computing Services University in the United States developed a very similar search tool in 1993, but at this time the search tool was able to search web pages in addition to indexing documents.

At the time, the term "robot" was very popular among programmers. A computer robot is a software program that performs a task uninterrupted at a speed that humans can't achieve. Because "bots" designed to retrieve information crawl from web to web like spiders, search engine "bot" programs are called "spider" programs.

and Google is an example.

Uses of spider silk: It can be used to make items such as bulletproof vests or artificial tendons.

The spider has a lot of silk pulp in its belly, and it has small holes at the end of its tail. When the web is formed, the spider picks up the dust spider and spews out the silk pulp. As soon as the silk pulp meets the air, it condenses into sticky silk, and with the web it forms, no matter what flying insects are, once they hit it, they don't want to run away again.

Spiders often secrete a layer of oil on their bodies and feet, and sticky silk is non-sticky. However, ordinary flying insects do not have this layer of oil, so the spider web can firmly stick to the flying insects but not the spiders.

The main chemical components of spider silk are glycine (NH2-CH2-COOH), alanine (NH2-CH[CH3]-COOH) and a small part of serine (NH2-CH[CH2OH]-COOH), plus other amino acid monomer protein molecular chains. The reason why spider silk, which is thin and soft in appearance, has excellent elasticity and strength is because: on the one hand, spider silk has irregular protein molecular chains, which makes spider silk elastic; On the other hand, spider silk also has regular chains of protein molecules in it, which in turn gives the spider silk its strength.

Introduction to spider silk:

Spider silk is known for its strong physical properties. The strength (tension per unit cross-section) of spider silk is greater than that of high-quality steel, and is comparable to that of many man-made aromatic polyamide fibers, such as Tveron or Kvera. What's more important is that the mass of spider silk is extremely small:

The mass of spider silk that can circle the earth is still less than 500 grams.

Spider silk is also very malleable, allowing it to extend up to 140% of its original length without breaking. Spider silk can maintain high strength at temperatures as low as -40 degrees Celsius. The toughness (energy required to break per unit volume) of spider silk is enormous and comparable to the commercially available synthetic aromatic polyamide fibers (e.g. aromatic nylon), which are already the standard name for modern synthetic fiber technology.

In addition, spider silk can also carry out directional water collection, causing water to condense around the nanofiber nodes, which is then transported to periodic spindle joints, where it accumulates into large droplets. <>