Do you think the bitcoin system is “evil” as paul krugman suggests? is it similar to a ponzi scheme?

Bitcoins work like a commodity with a value that fluctuates like a gold or silver. Like precious metals, or coffee and pork bellies for that matter, bitcoins are traded, and the rate of exchange rate goes up and down, so investors will buy or sell bitcoins to speculate on the variations in price.

White dwarf is very hot, but also very small and that is why it may appear dim.