When scientists tried to find a rubber substitute for the US during WWII, they stumbled upon a product that would entertain children for generations. Silly Putty is silicone plastic â€œclayâ€ sold in an egg-shaped plastic container and marketed as a children's toy. As an inorganic polymer, it can pick up ink when pressed against a newspaper; the imprint can then be stretched in any direction. It also bounces, breaks, and â€œmeltsâ€ into a puddle. What causes these unusual flow characteristics?
Back in the day
Operation Infinite Reach was a US cruise missile strike on purported terrorist bases in Afghanistan and Sudan. The attack came in response to bombings at US embassies in Kenya and Tanzania that killed at least 235 people and were linked to local members of al Qaeda. The US response targeted terrorist camps in Afghanistan and a pharmaceutical factory in Sudan, which the US claimed was helping Osama bin Laden build chemical weapons. Why was the US criticized for the attack in Sudan?
Born on a day like today
MiloÅ¡evic was the leader of the Serbian Communist Party and the president of Serbia from 1989â€“1997 and of Yugoslavia from 1997â€“2000. Following the dissolution of the former Yugoslavia, he promoted the idea of a â€œgreater Serbiaâ€ and supported Serbian militias in Bosnia and Herzegovina and Croatia. In 2002, a UN criminal tribunal charged MiloÅ¡evic with crimes against humanity and genocide; he died, however, before his trial concluded. What medical condition may have played a role in his death?