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Across

1 Sci-fi franchise about an Einstein-Rosen bridge (8)

5 In psychology, the human mind (6)

10 Typically, the third conspicuous earthquake wave to reach a seismograph (1, 4)

11 PC range launched by Apple in 1984 (9)

12 Relating to a specialist field (9)

13 Opposite of zenith (5)

14 Device for amplifying a very weak signal (6)

15 Wild cattle, extinct since the 17th century (7)

18 ___ mechanics, theory in physics to describe nature at the smallest scales (7)

20 Mary ___ (1913–96), UK palaeoanthropologist (6)

22 Category of young star (1-4)

24 Cipher also known as a zigzag (4, 5)

25 Female sex hormone (9)

26 German submarine or Unterseeboot (1-4)

27 In a flower, the tip of a pistil (6)

28 Medical condition characterised by high levels of nitrogen compounds in the blood (8)

Down

1 Dissolved substance (6)

2 Chile pine (9)

3 Proof in number theory that the sequence of prime numbers contains arbitrarily long arithmetic progressions (5-3, 7)

4 1994 sci-fi action film (4, 3)

6 Tectonic boundary between the Pacific and North American plates (3, 7, 5)

7 Suspended mass of droplets or crystals (5)

8 Anaesthetise with (C₂H₅)₂O (8)

9 Genus of flowering plants known as squills (6)

16 Facility low in dust and other particulates (5, 4)

17 Scaly or scale-like (8)

19 Optical illusion caused by bending light rays (6)

20 Gottfried Wilhelm ___ (1646–1716), German mathematician (7)

21 Big ___, first world war siege howitzer (6)

23 Nintendo games character who first appeared in 1990 (5)

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