How does Spider-Man stack up to reality?

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Spider Man has pretty sweet abilities,but let's take a scientific look to see how well this superhero stacks up to reality. For spider - man to become genetically modified,the spider that bit him would have to release a retrovirus into his body. Retrovirus carry genetic information which gets inserted into the DNA of cells. The cell then reads the new DNA to create specific functions and proteins for that cell. But this retrovirus will have to make it's way to nearly every cell and have the ability to code for new and different functions in each cell. So while it's theoretically possible,it would also be pretty amazing.

 Silk is actually proportionally stronger and more flexible than steel. Spiderwebs 1/10th the size of a piece of hair are able to catch insects flying upwards to 15 miles an hour. Believe it or not,if a web were an inch thick in diameter,it could actually stop a fighter jet. Some spiders can lift up to 50 times their body weight,this muscle strength is directly related to their size. Since spider - man is human - shaped and sized,the retrovirus would have to encode for the creation of more actin or myosin proteins. These proteins effect the contraction abilities of muscles,and in turn could make a human stronger.

 Climbing walls? Not a problem for spiders,they have tiny hairs on each leg and these hairs have tons of even smaller hairs with triangular ends which interact within nanometers of the atoms on the surface. This creates electrostatic forces,allowing them to stick with a strength of 170 times their own weight. To capture this ability,spider - man would need hairy hands and feet permanently. Finally,what about the spidey sense? Well,spider hairs are extremely sensitive to vibration and air pressure changes. 

 This means that spider - man could only perceive things that are near him,and not events at a distance. 

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