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Across

1 Cell structure formed early in embryonic development (8)

5 Dilute solution of NaClO (6)

9 Tennessee city; Manhattan Project production site (3, 5)

10 Country in which the Nobel prizes in chemistry and physics are awarded (6)

12 NaCl (for one) (4)

13 The study of the sea (10)

14 Rudolf ___, German engine pioneer (6)

16 Substance containing H₂0 (7)

19 Of a fluid, resistant to deformation (7)

21 The ___ Bay, peer-to-peer file sharing index (6)

23 Baroness Susan ___, UK neuroscientist and writer (10)

25 Form of inflammatory arthritis (4)

27 In linguistics, the state of requiring context, as with the words “there” or “then” (6)

28 Computer programs distributed at no cost to the user (8)

29 Simple eyes (6)

30 Silicate mineral, harmful to humans (8)

Down

1 The extraction of live cells or tissues for examination (6)

2 Cocaine, caffeine and nicotine, for example (9)

3 One of two offspring produced by the same pregnancy (4)

4 Following a valid process of reasoning (7)

6 Kind of lorry or trailer, can also be called a lowboy (3, 6)

7 Sound (5)

8 Aphid secretion (8)

11 ___ number, measure of speed based on the speed of sound (4)

15 Large wading bird, Platalea leucorodia (9)

17 Collins, Aldrin or Armstrong, for instance (9)

18 Amedeo ___, scientist whose constant is 6.022×10²³ mol^–1 (8)

20 Dermis (4)

21 North star (7)

22 Pressure; strain (6)

24 Space-trading video game launched in 1984 (5)

26 Waxy structure at the base of a bird’s bill (4)