Types of Dangerous Spiders. Arachnophobia, the fear of spiders, affects the psyches of many people to some degree, and the mere glimpse of a spider can send even the biggest individuals scrambling across the room. While most spiders are harmless to humans, several species do possess venom that can cause serious damage to a person if bitten. Of the world's five deadliest spiders, only two species, the black widow and brown recluse, are indigenous to the United States.| Sciencing
Octopus belong to the Cephalopoda class, which also includes species such as squid, cuttlefish and nautilus. More than 300 different types of octopus exist. They can be found in oceans all over the world in both shallow and deep water. The most common octopus people are generally interested in are the common Atlantic octopus, giant Pacific octopus, blue ringed octopus and the reef octopus.| Sciencing
The king cobra is the largest of all poisonous terrestrial snakes. Just 1/5th of a fluid oz. of king cobra venom can kill an elephant, according to Animal Corner. The king cobra is shy by nature, although it will defend itself when it must. The king cobra exists in southeast Asia and feeds mostly upon other snakes, leading to its scientific name of Ophiophagus hannah--Ophiophagus is Latin for "snake-eater."| Sciencing
Jellyfish are clear, dome-shaped aquatic creatures. Throughout the watery areas of the world lie hundreds of different jellyfish species. Although very simple in physiology, jellyfish can be very beautiful and peaceful looking. They also sport many interesting adaptations to help them live in the water. These features make studying jellyfish very entertaining.| Sciencing
Sciencing offers informative articles, instructional guides, and cutting-edge answers to pressing questions about science, engineering, and mathematics.| Sciencing
If you've ever looked for health supplements, you've probably heard of peptides. Research on is still ongoing, but here are some of the most promising ones.| Sciencing
Explore the hard sciences through stories derived from every discipline including discussion of theory, experimentation, and empirical fact.| Sciencing
