IRMO, South Carolina. Irmo, South Carolina, has a population of 11,223 and is located 10 miles northeast of Columbia, the capital of South Carolina. Chartered in 1890, the town was named for two officers of the local railroad whose names were Irdell and Mosley.
Either way--don't play with plutonium. The most toxic substance I could come up with is botulinum toxin--yes, the same material that is purified and injected (Botox) to remove wrinkles! When injected, the fatal dose is 1.3 to 2.1 nanograms per kilogram. So for an 80 kg adult, 104 to 168 nanograms (0.000168 mg).
The most venomous snake, measured by the LD50 test or any type of criteria, is the inland taipan snake of Australia. Image: Inland taipan snake by Wikipedia contributor. The inland taipan (Oxyuranus microlepidotus) possesses the most toxic venom of any snake in the world. But here again, that does not necessarily mean that the inland taipan -- also known as the fiece snake -- is the most dangerous or deadliest snake in the world.