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" ... At the end of these reactions, the total mass of what’s left over (the products) is always less than the total mass of what we began with (the reactants), with the remaining mass converted into pure energy via Einstein’s famous equation, E = mc2. If you learned about the periodic table prior to 2003, you probably learned that bismuth, the 83rd element, was the heaviest stable element, with every element heavier than that undergoing some form of radioactive decay (or decay chain) until a truly stable element is reached. ... "
" ... Of course, modern enzymes are often big bulky things comprising hundreds of amino acids. There are 20 amino acids to choose from, so countless combinations are possible. These big, complex enzymes are able fold into a stunning variety of elaborate shapes, enabling them to capture and hold reactants, and carry out reactions. They’re absolutely critical to the function of both simple and complex cellular life; we literally couldn’t live without them. ... "
" ... So what kind of conditions might foster such an unusual situation? Well, you’d need really high concentrations of all necessary reactants. It’d have to be wet all the time. And you’d have to have lots of energy available. All of these things are necessary because these interactions are really rare. The rate of reactions is dependent on temperature (the higher the better) and concentration (ditto). ... "
" ... The decay tracks of unstable particles in a cloud chamber, which allow us to reconstruct the... [+] original reactants. The opening angle between the sideways "V" shaped track will tell you the energy of the particle that decayed into them. ... "