Andrew Schwartz on Instagram: "If you’ve ever seen a random T. rex skeleton in a museum, there’s a decent chance they are a cast. While many museums DO exhibit the genuine fossils within a mount, it’s often preferable to display scientific copies of the bones instead. They’re lighter and easier to mount, keep the original fossils safe/available for study, and can be produced for exhibition in multiple museums. So why do a lot of museums have casts of the SAME Tyrannosaurus individual? Stan the T