2- Spider Web
Spiders have been around for over a 100 million years. Among many other things that fascinate us about spiders, is they silk web. The strength of the silk web made by spider is comparable to high tensile alloys that we use in construction and is half as strong as Kevlar, the material used in bullet proof vests. Like the honey bee, scientists are aware of the process to some extent, but have failed to replicate in their labs the natural silk proteins of spider. How the spider does it is still a question that needs more research.
1- Zodiac letters
A killer under the name of Zodiac terrorised the Bay area, California during late 1960’s and early 1970’s. He claimed to have killed over 37 people, however 5 were confirmed dead while only 2 injured. He sent around 20 letters to the local police taunting them to catch him. In his letter, he sent 4 ciphers, out of which, to date only one has been decoded.