I thought it was ironic to find this statement in an otherwise solid article:

"(So wrong. Mass cannot be converted to energy except through nuclear reactions)"

This is, of course, wrong. All energy has mass. A charged battery has more mass than an empty one. A chunk of fat weighs more than all of the byproducts that come from metabolizing it.

It's almost true, because the conversion factor between mass and energy is huge, so the change in mass for more mundane quantities of energy is far below what's reasonably possible to measure. But there's nothing special about nuclear reactions aside from the quantity involved.