It has emerged that The Smiler was manufactured by German firm Gerstlauer, which also built the trains for a rollercoaster in Six Flags Park in Texas from which a woman fell to her death in 2013.
Downing Street also struggled as it emerged that: Of the two million net migrants to the UK from the eight eastern European countries that joined the EU in 2004, just 13,000 people have claimed jobseeker's allowance (JSA).
Terrorism (including Irish terrorism) emerged as the No 1 priority, followed, less predictably, by cyberwarfare.
Though each of them had a very distinct reaction to the challenges of making art that seemed honest and relevant to the present moment, it was also true that in talking to the four of them separately, common themes emerged.
Zawahiri emerged as the "brains" of the militant group, playing a key role in several big attacks.
Details of the payment emerged in a report by the public spending watchdog published on Wednesday, which revealed that senior managers at the BBC were paid nearly £2m more than they were contractually obliged to over a three-year period.
From a family of lifelong Labour supporters, she emerged as a nationalist during last year's referendum campaign, giving up her job in the Pizza Mario chip shop to concentrate on politics.
During the hearing, it emerged that neither HMRC, the Treasury or the UK bank regulators appear to have questioned why HSBC's Swiss subsidiary had become a magnet for thousands of rich people across Europe and whether there was any systemic problem in the bank's governance.
Eventually he emerged, weak from his ordeal and his diet of only two bananas per day during his captivity.
Later it emerged that Peter Morrison, a local photographer for Associated Press, had been treated for a serious head injury after getting caught up in the violence between demonstrators and the police outside.
The police expanded their investigation to cover the Tories after it emerged that they had taken secret loans worth £16m.
