Consider for a moment, if you will... the common banana. It's the fruit - a berry, actually - of a large, herbaceous flowering plant. One of the millions of species of living things with which we share this beautiful blue orb, floating serenely through the cosmos. Small. Yellow. Unobtrusive. Conveniently packaged. Tasty. Friendly. On your side. In your corner, and rooting for you. Benign. Harmless... Oh. And it wants to kill you.
Consider for another moment... potassium-40. A radioactive isotope of potassium, with a half life of ONE BILLION, TWO HUNDRED AND FIFTY ONE MILLION YEARS. It's the only known isotope that undergoes all three types of beta decay, emitting electrons, neutrinos, anti-neutrinos, positrons, and gamma rays. You know... little tiny teensy weensy things that will kill you dead, dead, DEAD.
So. You know all that potassium that bananas are jam-packed with, that you've always been told is 'good for you'? Well, surprise! That potassium just happens to be potassium-40!
If you eat 10,000,000 bananas all at once, you will CERTAINLY DIE from RADIATION POISONING!
If you eat 274 bananas a day for seven years, you will experience CHRONIC SYMPTOMS of RADIATION SICKNESS!
If you blend 10,000,000 bananas together for one 12 oz smoothie, the potassium-40 will reach CRITICAL MASS and undergo FUSION, initiating a chain reaction and unleashing 100 megatons of NUCLEAR HELL!
Bananas. Who knew?