91av

ACROSS

8 0 (4)

9 1988 sci-fi animation directed by Katsuhiro Otomo (5)

10 European nuclear research organisation (4)

11 Judith ___ (1949–1986), astronaut killed in the Challenger disaster (6)

12 BBC wildlife programme presented by David Attenborough from 1954 to 1963 (3,5)

13 Component of an electrical circuit (8)

15 Seed-eating finch, Spinus spinus (6)

17 Supercontinent of the late Palaeozoic and early Mesozoic eras (7)

19 In photography, the ratio of the focal length of a lens to the diameter of the aperture (1,6)

22 1986 sci-fi film directed by James Cameron (6)

24 Phylum to which vertebrates belong (8)

26 To install new technologies within older systems (8)

28 Early steam locomotive designed by George Stephenson (6)

30 Integrated circuit (4)

31 Rotary wing of, for example, a helicopter (5)

32 Element, atomic number 10 (4)

DOWN

1 Unit of hereditary information (4)

2 ___ bomb, ordnance designed by Barnes Wallis (8)

3 Mechanical seal (6)

4 Organ found in the digestive tract of many animals (7)

5 Nathan ___ (1910–1999), Warsaw-born US mathematician (8)

6 Sanitary clothing worn by surgeons (6)

7 Genus of flowering plants; part of the eye (4)

14 Form of electronic communication (5)

16 Unreactive – like 32 Across (5)

18 Of a leaf, sword-shaped (8)

20 Field in which Robert G. Edwards won the 2010 Nobel prize (8)

21 CH₃CO₂^–, for instance (7)

23 Moon of Jupiter (6)

25 Mechanical model of the solar system (6)

27 Computing command; damselfly genus; letter in the NATO phonetic alphabet (4)

29 Reactive structure in organic chemistry (4)