What Is The World's Most Poisonous Thing?

Mercury I believe.

First of all you're all wrong!!! The box jelly fish is the most toxic thing to human. If we are talking plants its a plant in northern michigan and northern wisconsin, I can't remember the name but if you make skin contact with it and the oils it secrete get on you and you go in the sun your skin get a deadly reaction to the oils and begins to basically die. And the most toxic spider is the wandering spider( not the funnel web or the black widow!!!.)  The Colombian dart frog by the way isn't even that toxic in comparison to most other dart frogs and deep rainforest snakes. The only correct statement you people made was the inland taipan of Australia. So research before you make a statement like that!!!!!

Pragmatically, When comparing unit to unit of the same amounts, the most lethal toxin is nicotine.  Cigarettes, chew, etc.  Simply does not carry enough to kill you.  Only to give you positive effects.

Theoretically, one molecule of a black hole.  If you took a 1 centimeter cube of a black hole and put it on your table:  It is so dense and weighs so much, it would crash through your table, floor, cement foundation, dirt, layers of earth's rock and lava, and get lodged either in the middle of the earth or close to it.

There are several things in the nature which are very poisonous. These poisons are mostly used for defence against predators. When predators attack the poisonous animals or plants, it triggers the natural defence mechanism in these poisonous animals. The poison is released by them and the attacking predator is subjected to die eventually.

The most poisonous spider is the Black Widow Spider. The world's most poisonous plant is the castor bean plant. Castor bean contains ricin. Ricin is poison which stops the protein making process of the plant. These plants are very common. The most poisonous creature is the golden poison frog. They are highly toxic as they cause paralysis in the victim which ultimately results in death. The most poisonous snakes are Cobras and Vipers. The poison attacks the nerve cells in the victim and causes nervous breakdown ultimately resulting in death.

The Box Jellyfish.  They live around the Coral Reef in Australia.  Just touching a tentacle kills a person.

I couldnt tell you what the most poisonous thing is..because to keep it real there is uncharted parts of the world yet so we have no clue as to what kind of life is there so for all we know the most poisonous thing might not be heard of yet...but I just wanted to clarify 1 thing...the Brazilian wandering spider  aka the banana spider is the most poisonous spider discovered. But not the most poisonous THING...The box jellyfish or sea wasp is probably more dangerous than any of the other animals on this list. They’re not technically jellyfish, though they look a lot like them to me, but they are arguably the most venomous creature in the world. Tiny nematocysts on the animal’s tentacles contain the powerful venom and stick to their victims. Of all the creatures on this list that could sting me, I would fear this one the most. Its venom is so painful that there are several reports of people who passed out from the pain but kept screaming long after losing consciousness. They also kill more people per year, mostly in Australia, than any other animal on this list. Since records started being kept in 1884, it’s killed more than 5500 people..

The most poisonous thing poisonous to man kind is the golden dart frog its so toxic that if you touch it the poison will soak in you skin and will kill you in less than 60 seconds the box jelly fish is really toxic to the most toxic spider known to man kind is the Brazilian wandering spider

Blow fish

The second most poisonous spider is  funnel web spider

A cigarette contains over 400 toxic chemicals linked with various cancers and other diseases.

The most poisonous thing is a chemical made from Uranium, which is z-45u, one pin point of it could kill around 16000 people, in 1 hrs

Botulinum toxin. Clostridium botulinum, sometimes in uncooked sausages, is the organism. The toxin is injected into the face in "botox" treatments.

Black widow spider

Puss caterpillar

Politics...

Black widows are not the most poisonous spiders.

The deadliest poison known to mankind is Botulinum.

The human

To me the most poisonous thing in the world would be a human mouth as people tends to say bad things about others.

Snake - black mamba. Spider - black widow. Frog - dart frogs in S.America. Plant - castor bean plant.