Twin Studies on Earth and in Space a Window into Nature vs Nurture; Human Pig Chimera; 38 Thousand Year Old Engraving, and more

Air Date: Feb 04, 2017 12:00 AM ET

Twin Studies on Earth, and in Space - Nature vs Nurture; Early Human Artists Connected The Dots; Part human, part pig chimera; Evidence Torture doesn't work; Metallic Hydrogen-Did it Finally Happen?; Quirks & Question: Is Earth's Weight Changing?