Any californium in the human body.
Californium is dangerous because is very radioactive (gamma or alpha, depending on the isotope) and also a strong neutrons emitter. Californium may be a cause of cancers.
We don't contain californium excepting a professional contamination.
The density of californium at room temperature is 15,1 g/cm3.
Not much originality here - Californium, atomic number 98.http://en.wikipedia.org/wiki/Californium
350 billion per poundIt is $10 per microgram
Not californium, but neutrons emitted by californium.
All the isotopes of californium are radioactive, artificial and unstable.
Californium is radioactive and a strong neutrons emitter; californium can be lethal.
Californium has 98 protons.
Californium is a metal.
Californium is not flammable.
Californium is a metal.