Cole Hon What makes fireworks colorful? It's all thanks to the luminescence of metals. This great graphic shows what metals make what colors in fireworks! I really enjoy this graphic and I think everyone should take a look!
Time lapse simulation of human embryo development from post-ovulatory day 24 to 56 (Carnegie stages 11 - based on optical photographs of human embryos from the National Museum of Health and Medicine. By Brad Smith at the University of Michigan, Schoo