Isotope, in chemistry, one of two or more forms of an element that have the same atomic number but different atomic weights.
Fractals have been around forever but were only defined in the last quarter of the 20th century. Think you can wrap your brain around how fractals work?
We're all exposed to tiny levels of radiation, but a blast of it can leave you in agony -- that is, if it doesn't kill you outright. What is it, what causes it and how can we treat it?