73 We use this word because it's standard in science fiction, but UK English would require 'alternative'.

74 Named after the physicist Enrico Fermi. See Evolving the Alien by Jack Cohen and Ian Stewart.

75 It then comes as quite a jolt when we discover that the animal is a chihuahua.

76 The 'Shema' prayer, which orthodox Jews must say at least three times a day, includes 'And these words, which I command you this day. shall be upon your heart; and you shall teach them diligently to your children, and you shall talk of them when you sit in your house, when you walk upon the way, when you lie down and when you rise up.'

77 Of course it ceases to be laughable if, despite its bizarre appearance, it happens to be true. And we've already agreed that all religions are true, for a given value of 'true'.

78 Revelation xxi.16 gives it as 12,000 furlongs in length, breadth and height, or a cube 1,500 miles on a side. Noticeably smaller than the Moon.