Spider silk, though thinner than human hair, is shockingly stronger than steel and as strong as nylon of the same width. It can also stretch up to 30 percent of its original length without breaking. A 2-inch-thick rope made of a spider thread can even stop a Boeing 747, research claims.
I beg to differ!
48degF is 8,888degC
(Fahrenheit-32)/1.8 = Celsius
http://www.metric-conversions.org/temperature/fahrenheit-to-celsius-table.htm
Except a select few scinetists noone talks absolute temperature, ever heard that the midday temps i Florida will be around 600degF on the tube?