41. The improvements included the addition of electrical heaters that warm the O-ring seals to at least 75 degrees, regardless of external temperatures. 42. Design engineers added a third O-ring seal to the joints between the segments after the 1986 Space Shuttle " Challenger " disaster. 43. Notwithstanding the occasional pork chop, polar bears typically eat only when they're out on the ice and able to hunt ring seals . 44. Disintegration of the entire vehicle began after an O-ring seal in its right solid rocket booster ( SRB ) failed at liftoff. 45. O-ring seals in Challenger's right solid-fuel rocket booster deteriorated during the overnight freeze, and hot gases leaked from the joint at liftoff. 46. An unaddressed design problem with an O-ring seal on another part of the shuttle booster was blamed for the fatal 1986 Challenger accident. 47. The tragedy was triggered when high-pressure exhaust gases rushed past the O-ring seal with a force that ripped the rising space shuttle apart. 48. Thiokol's previous incarnation was Morton Thiokol, which was blamed for the O-ring seals that failed and led to the Challenger explosion in 1986. 49. Meeka Mike reaches into a hole in the ice of Frobisher Bay and tugs on the net, pulling out a fat ring seal . 50. With a rubber ring seal and a smaller bullet, the Chassepot had a maximum effective range of some with a short reloading time.
