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After more than a century of striving to propel screaming riders ever faster, higher, steeper and longer, many roller coasters now hurtle to the limits of human endurance. So where is there left for the tracks to go? The new attraction at the Surrey's Thorpe Park, Saw - The Ride, claims to offer the world's steepest freefall drop - a beyond-vertical 100-degree descent back under the ride's 100ft (30m) peak.
Read more and see video from The BBC.