I’ve occasionally seen references to using science to construct morality, so I discussed why this is impossible. (This is also a position which any who believes in scientisim—that the only source of knowledge is science—is forced into if they don’t want to hold morality and all associated human actions, such as law and criminal justice, to be completely irrational. They’re not going to want to do that because then they’d be holding that all the most important things in life are irrational.) And of course you can view this on YouTube: